How the many people in U.S. been white water rafting in the UK or seen Scotland's volcano?

There are lots of Volcanoes in Scotland. And I have seen plenty. I have been kayaking and canoeing in Scotland but never white water rafting. And I'm from Scotland, not the U.S. I would recommend it in June-July because those are the only months where you might not get rain every other day. Unless you like rain. Then August-May.