Puerto Rico Honeymoon Help

My FH and I are planning on taking our honeymoon in January of 2020 (about 3 months after our wedding) and are having a hard time picking a place. We both love to travel but he wants warm and I want Europe. However, I have been considering Puerto Rico, it seems like such an amazing place. If we went I would like to see more than just one section of the island, specifically San Juan area, and Culebra. Is it reasonable to do both in one trip? I would like to stick to a 7-day vacation. Would it make more sense to just visit Culebra one day and stay in San Juan? Or to split the trip up and spend a few days in both places? What is the best way to get to Culebra? I think we would do Airbnb instead of a hotel. Pretty much any advice on either place or Puerto Rico, in general, is greatly appreciated!