Most of the small bars along the beach are cash only. Many associated with a hotel will take credit cards, some have a minimum purchase for credit. The B.M.B.B. is a must if you are going to be in the area. just show up and buy a ticket, not sure if you can buy them with a credit card. There are several small stores along the beach road to buy red stripes, bottled water, snacks, etc. I know a lot of people prefer to not carry much cash, but it's much easier for small purchases and tips. I leave most in the safe box at the hotel, bringing smaller amounts with me when we're out and about. You can always go back and get more, or use an ATM.