You have 3 options:
A) 2 hours activity. Distance from Swan: 20 min. kayaking. For free. ( Swan Villas provide everything)
Cross the road with the kayak to the open sea side and paddle to False Caye (island in front). Go to the north side of the caye and enjoy the small but beautiful and full of life corals.
B) half day activity. Distance from Swan: 15 min. drive to Placencia Village and another 15 min with a boat to the cayes in front of Placencia. Book a tour company in Placencia. Around 40 USD/person
C) full day activity. Distance from Swan: the Diving center will pick you up at Swan, and 1 h 30 min. by boat to the Coral Barrier. Book with one of the best Diving Centers.Around 80 USD/person