Not far from Portbou there are a number of places to dive, both for experienced people and for those who want to get closer to the underwater world for the first time and need notions and support.
There are several places in the area to rent kayaks and/or to learn. You can make reservations from the hostel.
In the area there are several rental establishments for sailing the sea, and there are also learning courses.
Some fishing boats welcome companions in their daily work. An experience to get to know the art of fishing from the front line and to be part, for a day, of the crew.