If you want something a bit adventurous in Central America There's a place in Guatemala called San Pedro La Laguna. It's a small town situated on a lake you stay at a decent hostel for about $10 a night, since there are no name brand hotels there.There are plenty of activities there i.e. horse back riding, ziplining, motorcycling, cliff jumping and more. Its a really cool place although if your looking for the beaches again I wouldn't recommend. If I was hitting up a beach I would most likely go to Mexico or Honduras stay on 1 beach for 5 days and go scuba diving. There's a lot you can do in Central America you just need to narrow it down to what your looking for. Good luck.