I would suggest doing Roaring River! So long as you have a firm understanding of the cost of the cave, the cost of the tip for the cave tour and the cost of the tip for a tour around the area (nature tour). Enjoying the river swimming and chilling you can do on your own or if you feel more comfortable having your guide or driver there to keep the low pressure vendors away from you. For the past few years I've recommended the Vassell family for tour guides (with the get a firm price up front) and have not had a single complaint.

IF you want to have more things to do after Roaring River.....visit Sav! It's a delightful local type of town and it's fun to explore.