Sanur is probably the top spot in Bali for me. It lacks the culture and temples of Ubud, but also avoids the chaos and touts of Kuta. That means that for 4 days I did very little outside of sitting by the hotel pool, reading and swimming.
I don't think I'd recommend Bali to friends, it seems like the Aussies version of Spain. Sure if you've got a week to burn and a decent amount of cash in your pocket you could get some sun any time of year, and get a swanky hotel for peanuts, but you probably won't get much more culture than a week in a Turkish resort.
If there had been more time I think we would have gone across to Lombok, and to the eastern islands. These seem a lot less explored, retaining a bit more culture and beauty. Someone we met in Ubud did a volcano trek in Lombok and it looked absolutely stunning, pure natural beauty. Maybe I haven't given Indonesia a real chance, but it's also been nice to spend a few days relaxing before hitting Australia and the coral coast road trip!
P.s also not a fan of the food.... Major downside!