welcome to the bord Carmatt.
organized fishing is done over here in the bigger vessels from the Marinas and in Cabeza de Toro from the sportfishing club.
but at your resort you walk the beach(face water and turn let) and right at the end of the resort, aside of the Palace hotel, is a huge vendor market(named Bibijagua), there you find taxiboats, small speed boats, you can rent one with skipper to get brought around. always bring your own light tackle spinning gear(8-10lbs line) or flygear(7-8 wt).
good luck
Mike