Master’s Degree – Postgraduate… What should I do?

Hello!!!!!! I’m new around here, and I recently graduated from Civil Engineer. I live in the Dominican Republic (Caribbean - Near Puerto Rico). I am 22 years old. I am looking to do a Master’s Degree or postgraduate. The thing is, I do not know which area/specialization fits better to my likes.

I am looking for some advice, recommendation, or comment on the different areas that the civil engineer offers in which they include (some, if all better): creation, design, tampering, computing (&Technology in general), not jobbed-attached (Something which I can undertake later on).
Thanks a million :D !!!