Oahu notes

1. Surfing
1. The ocean i.e. the reef @ Waikiki is shallow. Don't be scared :)
2. All you need to do is stand up on the board :)
3. If you fall, just pull the board back to you using the harness, don't swim to it :)
2. Snorkeling
1. The equipment is available in stores, practice in a pool
2. It is quite easy.
3. Rental Car
1. you don't need one
2. Most places have tours that pick you up from the hotel
4. Air turbulence 
1. It is OK, don't be scared :)