DO 

• shop around when changing money as rates can vary !
• put on loads of High Factor Suncream (especially if you intend to spend a lot of time in the water).
• drink a lot of water (bottled only !) and eat a lot of  fresh fruit - do your body a favour.
• be careful with your belongings at all times. Crime is rare but it can ruin your holiday. Some cases of handbag-snatching have been reported, so leave important documents in your hotel safe, or wear your bag across your shoulders !
• try not to step on offerings in the street (walk around them).
• respect the slow pace of processions when stuck behind one, i.e. don't honk !
• haggle when buying (except on price-tagged goods).

• swim outside designated swimming areas on the beach, currents can be very strong.
• do drugs ! - it can carry the death penalty and there are enough foreigners residing in Bali courtesy of the government prison service !
• touch people's heads - this is very offensive to Hindus.
• enter a temple during menstruation. Sorry Ladies !
• forget to put salt on your food - you will probably sweat a lot.
• worry about the ice - it's government quality controlled in established bars & restaurants.
• forget to reconfirm your outbound flight. (Airport Departure Tax is Rp. 25,000 for international & Rp. 11,000 for Domestic flight).