It's a smooth ride when you're floating on air. Naturally buoyant, inflatable kayaks from Air Kayaks are excellent whitewater trainers. Fit them with skegs and you have a great flatwater craft. You can get started for as little as $199 with the Advanced Elements Firefly. When you're done, fold up your and store it in a closet. It's as easy as that. No, really. it is.