I've grown up with hermit crabs (and scars on my hands...I was always fond of the gargantuan ones

). They're so cute (if you close one eye and squint with the other) and cuddly (if you wrap them in a sock).
We let ours out on the porch, and we'd find them an hour later halfway up the screen door.
I live near a tourist town, so every blasted beach store has them, and most of them live in HORRIBLE conditions. They have huge bowls of water with deep lips (crabs are supposed to have only a sponge...if they climb in the bowl and can't get out, they eventually drown), and no food. And there's usually at LEAST ten or twenty lying dead on the bottom of the cage. I used to have about six, and I kept them in my room. I had them in a glass terrarium, but when they would walk around at night, the pebbles and shells would hit the glass...pretty loud for little crabs.
I also had one called Slim. He was about 5 inches around, and three inches across. He was missing his dominate claw (which is why I bought him...no way was I getting another evil monster with a pincher the size of Texas). Ahh, the memories...
They're SO cheap and easy to maintain, too. A little expensive to start out, but once you get them food, pebbles, and a home, they're great.