There are tons of shows to see in Vegas that are 18+ (with AND without the parents lol) so it all depends on what kind of things you want to do... if you walk down the strip at night Treasure Island has a free show on the street (find out what time it starts and get there a few mins early if you want a good spot)... There is Freemont street where you can check out the huge ceiling that s a TV... there is an aquarium at the Mandalay Bay hotel... there is a mini theme park / carnival thing at Circus Circus... in a town near there is a chocolate factory tour you can attend (it also has an M M store) ... there is a ton to do in and around Vegas... and if you have a car you guys can go see Lake Mead!!! There is also a scary roller coaster and a nice view on top of the Stratosphere...
Do what Vegas teenagers do visit the national parks that surround Las Vegas. Just to name a few: Red Rock, Lake Mead, Valley of Fire. Explore the park before you come by looking at VegasNature.com
roller coaster at sahararollercoaster at newyork newyorkAdventuredome at circus circusStratosphere rides uhhh thats it
The strip is not for kids. Do something else.
Pray that you get to be 21 and come back in two years