In Cabarete... hit Lax before 11pm (and maybe after), Bambu & Onno's after 11pm.
VoyVoy is a possibility Monday night (karaoke), Wed night (live band), Thurs night (ladies' night). VoyVoy often attracts a crowd that shifts to Onno's & Bambu about 12:30.
All are in center of town directly on the beach within 3 or 4 minute walk of each other. In order West to East... Lax, Bambu, Onno's, VoyVoy.
Never know which will be busiest... changes night to night. Friday/Saturday nights typically the busiest.
Cabarete open til 2am weeknights, 3am fri/saturday. Many locals don't come out til after midnite.