What are the must do, must eat and must visit things in Bali?

I think must do are Surf at Kuta Beach Scuba or snorkel at Sanur Rendang, originally a coconut flavoured curry with water buffalo meat now almost exclusively served with beef, delicious Try some of the fish dishes and we got one of the hotel staff to buy and cut open a durian fruit for us. Strange and distinctive taste and smell. Must visit Ubud, the Palace there is worth a half day the market is fascinating and we also had a guided walk around paddy fields and a local village. Gunung Agung highest peak in Bali and a grumbling volcano Must enjoy the Balinese people and try not to get to annoyed with the hassle from street and beach vendors

One thing i loved doing was doing the night climb up the volcano. You climb up it at night which takes a couple of hours and then at the top you get to see the sunrise which is magical. You can see the ops of the other volcano on Bali and that of the volcano on Lombok. If you have the time then a trip to the Flores Islands which are just off Bali. What others have already said is a must, though you only have 6 days and to do all of this you'll be pushed for time. You can do a long day tour which combines many of the highlights of Bali in one trip and i did one and it was great and worth doing. There are many places around Kuta and also hotels in which you can book these trips. I would have a look around and see who offers what and barter them down on the price.. Have fun and enjoy the beautiful island. I loved it and was there for 3 weeks and could of stayed for longer.