You can safely book a boat at Cliff's Marina - this is probably the best place on Possum Kingdom Lake. My friends and I rented a pontoon there for a day, and everything went without a single hitch. Booking is simple - through the website, everything is ready upon arrival. The boat was clean, well-maintained and fully fueled. The staff is very responsive, they help you navigate if you are not a pro. The marina itself is cozy, and it's stone's throw from The Inn at the Cliffs, where we spent the night. The scenery is just fabulous: cliffs, clear water, nature! For a family vacation, it's the best place where you feel like a welcome guest.