4 day Trip to Costa Rica

I’m going to Costa Rica between May 2- May 6

for my birthday it’s just me and my sister. I picked Costa Rica because I thought I could get a blend of white beaches, relaxing beach vacation with some adventurous and gorgeous views.

The problem is that to get both of these experiences I need to go two different cities. Manuel Antonio and La Fortuna

I really need to find hotels but with only 3.5 days in Costa Rica I’m not sure if going to two different cities is worth it

If I had to pick one I’d do La Fortuna, but having so relaxing time at the beach would’ve been nice

Is it possible for me to go to both cities? What should my itinerary look like for both cities? Do any Costa Rica have a good itinerary?