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Build a hill with gravel sloping from one side of the tank to the other and add just enough water to reach partway up the slope. You can do it either left to right OR front to back. Customize it for the best appearance. You could create an "island" with rocks for him to sit on as well or instead.

use like the stuff u have at the bottom of a fish tank them little stones and do a thing going down into the water

use glass and calk and or use stones and put you substrate on top if you do this make sure the rocks are above the water so you can put land then water.

plexiglass and waterproof, animal safe caulking