First, make sure you can actually sit in the boat. Remember anyone can squeeze into a boat for 5 minutes but what is you ass going to feel like in 30 minutes? Next, take a flashlight and look inside the boat for wear around the seat and pilars. And look for micro cracks in the hull. Look the boat over for discoloration. Sun fading and shiny spots where welding or a heat gun may have been used. Loosen the outfitting and make sure it moves freely. Always ask the seller if they have any extras they would be willing to throw in. Rope, bingers, dry bags are all nice. Make sure YOU like the boat. Don't get talked into buying a boat. People who like their boats are more likely to use them. Here's the bad part. No matter what boat you buy, your gona want something different next year. good luck.
Bound is boatless man