Just south of the airport, Ocean Rider breeds seahorses commercially so buyers don't need wild-caught ones. The tour is more engaging than you'd expect — you handle the seahorses, learn about their biology, and can watch dozens of species at various life stages. Seahorses are genuinely strange creatures (the male carries the young; they mate for life), and the guides know their stuff. Tours run only a couple of times a day, so check the schedule before you go. Around $20 per person.
Ocean Rider Seahorse Farm
Hands-on seahorse breeding farm with guided tours