There are many places to visit, especially for first time visitors. I suppose you are there for photography too, if not you wouldn't have asked in ClupSnap :bsmilie:
In 3D2N, you should be able to do:
Day 1 > Jatiluwih (rice terrace) > Pura Ulun Danu > Mengwi Taman Ayun > Batu Bulan > Tanah...