If ever there was a location best suited to the float tube it would have to be Orkney. Lochs all close together, easy access (apart from the vast amount of barbed wire in the fences) and plenty troots. Well ok there's Shetland as well, and Assynt's not too bad, and Caithness is pretty good, oh and Sutherland and Islay and oh feck it i'll start again.
If ever there was a country best suited to the float tube it would be Scotland.