Here are two pics of my gators setup. He is in a 40 gallon breeder with a dueto filter for filtration and current. On the left side of the tank is a 18" slab of slate for "land" that has a 100watt bulb for basking and heat. On the right side is a large rock for him to climb out on to get out of the water but away from the heat. He has misc plants and weeds for "cover" and he can swim under the slab of slate to get away from everything completely. There is also a fluorescent light that runs the length of the cage up top.
Here is a pic of his entire setup: If you look closely you can see the gator just to the right of the slate on the left hiding in the weeds.