What they smell like: citrus fruit and sunshine ("the corniness of this phrase made Sasuke cringe" <-- guess which fanfic is this coming from!)
How they sleep (sleeping position, schedule, etc): Naruto is a terrible sleeper that moves around, mumbles aloud, creates jutsus while sleepwalking, it's really hard to wake him up...but since he's a ninja, he can sleep pretty much anywhere. Of course, he would complain if it's an uncomfortable place.
What music they enjoy: probably bubblegum pop. Some pop rock. And he'd rather die than admit that he really likes Disney's music.
How much time they spend getting ready every morning: Probably about half an hour or less? He wakes up, brushes his teeth, clean his stubbles, sloppily combs his wild hair, changes his clothes (he rarely chooses something outside his orange norm), fasten his headband and that's it.
Their favorite thing to collect: Friendship. :P Ok...and Naruto likes collecting all kinds of seeds. Some he'd try cultivating, others he would just put inside a box, so that he would reminisce the memories around the seed he earned while he was visiting a certain city or a certain person
Left or right-handed: Right handed.
Religion (if any): Shintoist.
Favorite sport: Annoying Sasuke American football because the need of lots of teamwork.
Favorite touristy thing to do when traveling (museums, local food, sightseeing, etc): Obviously Naruto's favorite hobby is finding the most popular ramen restaurant from the city he's visiting. Then, I guess he enjoys finding good hot springs (he got this habit traveling around with Jiraiya). And then he likes visiting green houses and getting to know their local flora.
Favorite kind of weather: Sunny
A weird/obscure fear they have: Fear of Sasuke dying. Wait, it's not obscure.
The carnival/arcade game they always win without fail: Naruto is addicted to Naruto Ultimate hero *nods*