The surrounding mist-shrouded hills provide a great backdrop to the vibrant lake especially as the day rolls on and light changes from stark to diffuse.
You'll usually find locals hanging around the front side of the lake taking photos with their new cameras as is the trend nowadays at beautiful spots in Java. Walk further around the lake to the right and you reach some old Hindu caves, some of which are locked shut, some of which are open to inspect. They're slightly disappointing and of more interest to the devoted than anyone else but you'll see old candles and offerings littering the area as evidence of past prayers.
A walking track leads around the left edge of the lake, but it ends up in the nearby farmland rather than anything interesting on the lake itself. In fact, if you choose to circumnavigate the lake entirely, you're in for a muddy walk as parts of the tracks are like a marsh and it's impossible to escape its muddy clutches – that is, your feet will get wet and dirty.
Telaga Warna is the last stop on the inner circuit and is only 350 metres from Candi Bima and the Kawah Sikidang turnoff. From Telaga Warna, it is a further 1.4 kilometre walk around the loop to the main Dieng intersection, thus completing a 5.5 kilometre walk, which should take less than four hours including stops for lunch.