We carry a pair of kayaks on top of our 22' Cruiser. We basically use the boat as a mothership and spend much of our time exploring in the kayaks once anchored. They are mounted on a Yakima rack on the roof. It takes a little bit of effort to get them up or down, but we now can get both on or off in about 10 minutes. We are sea kayakers as well, but decided that our 17' Seaward Tyee kayaks were too long to carry on top. We considered smaller play boats, but decided that these would be to limiting, as they might be fine for exploring around a harbour, but not fast or stable enough for longer excursions. We choose 13' Seaward Mantra kayaks as our boat toppers, which have proven to be very stable and really fun boats to explore in. So far we have used them on numerous lakes from Atlin in the Yukon/BC to Powell in Utah and around Vancouver Island. We have no regrets investing in real kayaks instead of Costco play boats. We have tried towing them, but they are much better on the roof of the boat. See our album 'Mistaya' for photos.