There's nothing like spending time by the water while you're on vacation. Bring a picnic to Lake Batur and then hang around for a peaceful sunset.
You'll have sightseeing choices galore in Kintamani. Lake Batur is an ideal place to begin here, but there are plenty of other fine spots to visit. Mount Batur, Batur Natural Hot Spring, and Toya Devasya are close to the body of water and will round out your day nicely.