The other thing to do, of course, is swim. The water is cool and refreshingly clean (no chlorine to contend with). So get your bikini out - the one you haven't had a chance to don since Phuket 2006 - and cool off in the lake. With the clear air and the fresh breeze that Mae Ngat enjoys, this is an opportunity to top up your tan. Take Sunblock. You'll need it if you like swimming and sun worshipping.