I currently own a Marin Hawk Hill that I got for a sweet deal($290 NEW including shipping from Sierra Trading Post). I've ridden it a few times, but it gets so hot down here(New Orleans) that I can't bring myself to take it out much. I've been looking at some other bikes online and have seen a single speed bike that I was interested in. Is a single speed like the Schwinn Stingray of my youth...meaning no gears, just pedal and the faster my legs move, the faster the bike goes? What is a fixed gear bike? I wouldn't mind having a decent Mtn bike with no gears or shifting. I live in New Orleans, like I said, and we don't have any hills or trails to really speak of. I'd rather have a bike that I can just cruise around the park, the neighborhood, occasionally the bike trail, which is about 20 miles away, etc. Would a single speed be good for me? I'll be honest, I'm a mtb newb for the most part and I don't really understand much about the shifting and gears on my bike anyway. I usually put it in a gear I'm comfortable with at a good pace, and leave it there the whole time.