Things To Do
If this is your first time travelling to the island or it's been a while, I recommend you visit the AirBnB website (shared below) to search for and book any excursions you are interested in. It is best if you book, in advance, as these activities may no longer be available by the time you get to the island. You can choose whatever dates you're interested in and the website will show you what activities are available on a given day. It is important that you also check the location of the excursion to ensure that it is within the distance you're willing to travel. You can find various options under the tab titled "Experiences". The activities include, but are not limited to, touring Puerto Rico's Rainforest ("El Yunque"), Old San Juan and bioluminescent bays along with cave tubing, snorkeling, ziplining and horseback riding, among others.
Another option is to check out the Discover Puerto Rico website (also shared below), which provides an array of recommendations.