Except that then my mind went blank. So I asked Twitter. And people came through with a raft of suggestions.
So, just in case you're in a similar position, here are some of the books recommended that sound as though they might be worth trying.
Ian McDonald, Planesrunner.
When Everett Singh's scientist father is kidnapped from the streets of London, he leaves young Everett a mysterious app on his computer. Suddenly, this teenager has become the owner of the most valuable object in the multiverse—the Infundibulum—the map of all the parallel earths, and there are dark forces in the Ten Known Worlds who will stop at nothing to get it. They've got power, authority, and the might of ten planets—some of them more technologically advanced than our Earth—at their fingertips. He's got wits, intelligence, and a knack for Indian cooking.
recommended by @CherylMorgan and @FredKiesche
Cory Doctorow, Little Brother
Marcus, a.k.a “w1n5t0n,” is only seventeen years old, but he figures he already knows how the system works–and how to work the system. Smart, fast, and wise to the ways of the networked world, he has no trouble outwitting his high school’s intrusive but clumsy surveillance systems.
But his whole world changes when he and his friends find themselves caught in the aftermath of a major terrorist attack on San Francisco. In the wrong place at the wrong time, Marcus and his crew are apprehended by the Department of Homeland Security and whisked away to a secret prison where they’re mercilessly interrogated for days.
When the DHS finally releases them, Marcus discovers that his city has become a police state where every citizen is treated like a potential terrorist. He knows that no one will believe his story, which leaves him only one option: to take down the DHS himself.
many recommendations, including @bylisagold
Mark Zusak, Underdogs trilogy, ,
Cameron and Ruben Wolfe are champions at getting into fights, coming up with half-baked schemes, and generally disappointing girls, their parents, and their much more motivated older siblings. They're intensely loyal to each other, brothers at their best and at their very worst. But when Cameron falls head over heels for Ruben's girlfriend, the strength of their bond is tested to its breaking point.
recommended by @greenspace01 ("Brother, boxing, wanting girls...")
Scott Westerfield, Uglies
Tally Youngblood lives in a futuristic society that acculturates its citizens to believe that they are ugly until age 16 when they'll undergo an operation that will change them into pleasure-seeking "pretties." Anticipating this happy transformation, Tally meets Shay, another female ugly, who shares her enjoyment of hoverboarding and risky pranks. But Shay also disdains the false values and programmed conformity of the society and urges Tally to defect with her to the Smoke, a distant settlement of simple-living conscientious objectors. Tally declines, yet when Shay is found missing by the authorities, Tally is coerced by the cruel Dr. Cable to find her and her compatriots–or remain forever "ugly." Tally's adventuresome spirit helps her locate Shay and the Smoke. It also attracts the eye of David, the aptly named youthful rebel leader to whose attentions Tally warms. However, she knows she is living a lie, for she is a spy who wears an eye-activated locator pendant that threatens to blow the rebels' cover. Ethical concerns will provide a good source of discussion as honesty, justice, and free will are all oppressed in this well-conceived dystopia. Characterization, which flirts so openly with the importance of teen self-concept, is strong, and although lengthy, the novel is highly readable with a convincing plot that incorporates futuristic technologies and a disturbing commentary on our current public policies. Fortunately, the cliff-hanger ending promises a sequel.
Many recs, including @sleary ("Post-apocalyptic hoverboard adventure...")
The Absolutely True Diary of a Part Time Indian, Sherman Alexie
Arnold Spirit, a goofy-looking dork with a decent jumpshot, spends his time lamenting life on the "poor-ass" Spokane Indian reservation, drawing cartoons (which accompany, and often provide more insight than, the narrative), and, along with his aptly named pal Rowdy, laughing those laughs over anything and nothing that affix best friends so intricately together. When a teacher pleads with Arnold to want more, to escape the hopelessness of the rez, Arnold switches to a rich white school and immediately becomes as much an outcast in his own community as he is a curiosity in his new one. He weathers the typical teenage indignations and triumphs like a champ but soon faces far more trying ordeals as his home life begins to crumble and decay amidst the suffocating mire of alcoholism on the reservation. Alexie's humor and prose are easygoing and well suited to his young audience, and he doesn't pull many punches as he levels his eye at stereotypes both warranted and inapt. A few of the plotlines fade to gray by the end, but this ultimately affirms the incredible power of best friends to hurt and heal in equal measure. Younger teens looking for the strength to lift themselves out of rough situations would do well to start here.
recommended by @SalamanderHouse
Jumper, Steven Gould
What if you could go anywhere in the world, in the blink of an eye? Where would you go? What would you do?
Davy can teleport.
To survive, Davy must learn to use and control his power in a world that is more violent and complex than he ever imagined. But mere survival is not enough for him. Davy wants to find others like himself, others who can Jump.
And that's a dangerous game.
and Wildside, Steven Gould
Forget the lottery.
Teenager Charlie Newell has just discovered something that will make him and his friends billionaires. What if a world existed in which no humans ever evolved? No cities. No pollution. No laws. A fantastic world filled with unimaginable riches in which everything--everything--was yours just for the taking?
Charlie has found that world. And he plans to use it to make him and his friends rich.
There is a problem: How do you keep something this big a secret?
recommended by, well, me.
And a trove of good old-fashioned adventures, e.g. Treasure Island, King Solomon's Mines, War of the Worlds, The Time Machine, Kidnapped, Beau Geste, and Lawrence of Arabia, recommended by @JemFoxy
Also, try Guys Lit Wire, a blog full of reviews about, well, Guys' Lit.