(sand is great, and you can build her a cave with pieces of slate, and you can give her a nice piece of driftwood to hang out on too)
chicken kisses
(yeah, I have a piece of bark in there, and she built a tunnel system with that as the entrance. I got some aquarium plants from the pet store and put those in their to make it pretty, and sometimes she'll climb on them. Here favorite is a stick that goes from one side to the other, and her tank is almost 2 feet long! I'll get some sand next time we go to the pet store and put that in her tank.)