Going to Bali.... any tips

I'm thinking of going to a surf resort in the Mentawais for their 11days, and then staying in BALI for a week or two on the way back home to Australia.
The Mentawais is expensive to fly to, and the resort itself is not cheap (for me).
Can anyone suggest even a particular HOTEL (or area) in Bali to stay at while I'm there. There seem to be alot of hotels in different areas and I'd like to be near the waves, but what area is best.
In BALI, do you walk to the surf spots, do you carry money for transport to and out the waves, how do you keep your money/belongings/hotel key etc. safe while you surf. Never been overseas and I have no idea right now.
The Mentawais is expensive to fly to, and the resort itself is not cheap (for me).
Can anyone suggest even a particular HOTEL (or area) in Bali to stay at while I'm there. There seem to be alot of hotels in different areas and I'd like to be near the waves, but what area is best.
In BALI, do you walk to the surf spots, do you carry money for transport to and out the waves, how do you keep your money/belongings/hotel key etc. safe while you surf. Never been overseas and I have no idea right now.