Sit-on-top kayaks are the most user friendly paddlecraft. They are very easy to paddle, very easy to transport, and very safe. If you flip over in a sit-on-top, all you have to do it flip the boat back over, and then wiggle your way back on top. Since you're sitting on top of the kayak, it never fills with water. This is the main advantage of a sit-on-top kayak. The downside to sit-on-tops is your lower body is always going to be exposed to the elements, like the sun in the summer and splashes of water in the winter. This is easily remedied by using sunscreen or wearing water proof paddling clothing.