Go white water rafting in scotland where youll join others in an inflatable eight person raft with an experienced guide on some of the uk s best white water the river tay set in the heart of highland perthshire is the longest river in scotland and famous for diverse white water starting at a few splashes for the tame at heart which is graded 1 on the uk s white water graded system to white knuckle stomach churning rapids and beyond which go up to grade 6 that is far too rough to offer comm