Flying into Liberia, Costa Rica. What should I do and where should I visit?

Flying into Liberia International airport. Will be staying in Liberia at the Hilton Garden Inn. Will be there for 2 days 3 nights. I am looking to have the most fun with the littlest amount of $ and mainly to go on the beaches and to the clubs/bars. I'm a single male in my mid twenties and will be by myself. What are some good beach and beach towns that are easily accessible by bus? is the town of Liberia safe, clean etc? A nice place for a single man looking for a fun time and some single ladies. I'm not the most seasoned traveler so any tips or advice would be appreciated, Thanks!