Dan
Contributor
Utila for snorkeling in early Spring.(March-April)or Gladden Spit (Southern Belize) for diving with them right after the Cubera Snapper spawn (around the full moon May-June) Both have really clear water all the time.
Some links
Utila Official Site - Utila, Bay Islands, Honduras - Tropical Island Paradise
Best time for Whale Shark Season around Utila in Honduras 2018 & Map
Whale Shark Dive Trips | Splash Dive Center | Placencia Belize
We snorkeled with 8 over 3 days a few years ago in Utila. Saw one vertically feeding and one seemed to like the attention and made multiple passes around us. My buddies were able to dive with them on every Splash trip they took there during a week of diving.
I was in Utila in August 2007 for a week & saw none. Got my legs chewed badly by sandflies (no-see-um). That’s the last time I ever want to go to Utila.