Stand-up paddleboarding is the gateway watersport. You stand on a big stable board and paddle along, and on calm water most people are doing exactly that within a few minutes. The wobble settles fast, and then it is just you, the water and a nice view.
From there it goes wherever you want. A gentle paddle on a flat lake, a longer tour along the coast, a bit of SUP yoga, or even small surf once you are confident. It is as relaxed or as active as you fancy on the day.
The instructors on adventuro run tasters, tours and technique sessions. A quick lesson sorts your stance and paddle stroke, which keeps you upright and saves a lot of unplanned swimming.