My family has a houseboat on Green River at the Green River Marina, I would recommend the floating cabins at the marina. They've got some great fishing there, and these cabins are literally ON the water. Each one has a slip on the side of the cabin where you can park your bass boat, and you can do swimming right out the back door. Each one has a grill, TV, plenty of walking areas throughout the marina. Plus, you cant beat waking up and looking out the front door onto water.

Here's a link to the page regarding those cabins, and they come in a couple different sizes and price points

Floating Cabin Vacations - Green River Marina - Green River Lake