We chose not to take a tour but do thus ourselves. So easy just drive from Granda along the lake where there are lots of boats for hire. We had a boat to ourselves and it was majestic. There's a tiny island with monkeys, lots of wildlife and the scenery is epic. We stopped at one of the many restaurants and drank a very cold bottle of beer, sitting overlooking the lake in the afternoon is a memory I'll cherish. The people were amazing welcoming and very friendly. An extremely pleasant boat trip that you need to do!