There isn't anything else to do in Tunica. If you want to do anything at all you need to head to Memphis. It's about 30-40 minutes away depending on how fast you drive.
If you like BBQ........eat at Corky's BBQ at Sam's town. They usually hava a buffet with all the ribs, chicken, and fixings for a set price of $8-10 depending on the day. This buffet also includes your drink. And draught beer is also included. My advice is to stick with the ribs, both wet and dry are great. Have fun!