Even in the "tourist capital" of Tuk Tuk, there are few tourists to be seen! This lake is nice for a 2 day visit, rent a scooter for 100,000 IDR for the day ($7!) and show ourself the peninsula. Hike up Pukit Buhur - but you need a local guide - but you may have the whole hike to yourself - we didnt see one other person!
Really friendly people, nice views, nice looking lake (we didnt swin, apparently its a bit polluted). But looking at the old caldera - this is a cool place to visit, the lake is massive