Turtle set ups are PRICEY. of course I'm sure youll do all the research so I'm not going to start with it, but turtles need huge filters.
I don't know the dimensions of your 29 gallon high, but you could probably fit in a musk/mud turtle. They max out at 4 inches. It may take you a while to find a breeder, I don't hear too much about them. These turtles are also called stinkpots, if you scare them they will release a horrible smelling liquid, so I don't know how possible handling is if you want something interactive.
For other interesting pets you could look into crabs, some lizards, or even mudskippers (yes they are fish but they are fish that need land!)