Just a little reminder: Good isn't cheap and cheap isn't good. However, reasonable prices are available at numerous bars. Always ask if the prices are in Belize or US dollars. A few resorts charge in US. Some larger tourist bars are higher priced.
In my opinion you can always ask the bartender what the price of a beer or drink is and you will find that some resorts are a little pricy but not like airport prices. We have in the past used the pool at some resorts but the trade off is we drink the drinks.