Some of these are for big kids, others are for small kids:

Activity NameFacility NameLocation NameActivity DescriptionTime InformationPrice
Gondola RideVenetianMid Strip$16 per person
Adventure DomeCircus CircusNorth StripAmusement Park with many ridesPay by ride or get an all day pass
Stratosphere thrill ridesStratosphereNorth StripExtreme RidesPrices per ride vary. $34 all day pass
Las Vegas Mini Grand PrixOff StripGo cart racing, other rides and arcadeMonday thru Friday: 11AM - 9PM Saturday and Sunday: 10AM - 9PM$7 per ride
Pinball hall of fameOff StripPinball machines and other arcade games, but mostly pinballPay by game 25 cents and up
Indoor SkydivingOff StripFly above giant fans as you skydive indoorsPrice varies by date and length of time on ride. Minimum $75
Spungbob and extreme log rideExcaliburSouth Strip3D simulator ride$9.95-$12.95
Roller CoasterNew York New YorkSouth StripRide a rather large rollercoaster around the outside of NYNY$15