Did you say a bike with gears would be too complicated for you?

No offense, but 8 year olds know how to switch gears on a bike. It's easy, you just flip the gear lever to make the pedalling easier or harder.

I made the mistake of buying a CCM mountain bike from Wal-Mart (you can mock me if you want to regarding this). I hated the damn thing. The bike floated when you hit a bump. I still have it, minus a rear wheel.

I got a better one towards the end of last summer though. Nothing super duper, but it's a freestyle mountain bike made by Supercycle. It has both front and rear shocks, nice big frame, dirt wheels. I got up the trials everyday here. Cost me $150 with 50% off from $300.

It's best to shop at the end of the season for sporting stuff as it's dirt cheap.

For hilly areas and trials, you're going to wait some gears. Cruisers are good only for the streets and flat roads, but if that's where you live, then sure, why not, but I would spend the extra cash and get something that will be worth it in the long run and last you.