Easter week, (the week before easter) is when san jose shuts down, and everyone in costa rica goes to the beach, as another poster had mentioned.
However, semanana santa is a holiday all throughout latin america, and thus prices are high, hotels and flights are either booked out or at very high prices.
I would honestly try to travel another weekend if I were you. If you are new to costa rica though, semena santa week is a great time to walk about san jose (in the day time), or drive about (again in the day time, as the traffic will be less than at any other time during the year.
PetRoto wrote:
I´m currently living in Costa Rica and I want to make a weekend trip or 2 or 10 for some fun

I remember reading that there was a holiday period of like a week where the chances of finding anything is slim to none. Does anyone remember when that is? I don´t want to spend the money and head somewhere only to find out that.. oops.. noone is there...