I just returned from a 10 day trip to AC. I dove with Ramons Dive Center at Ramons Resort the entire time. Here is what I learned about the Blue Hole trips this time a year. This time of year it is very slow. Actually next month is the slowest time of year for diving on Ambergris Caye. So not all the "Big" boats go to the Blue Hole everyday. Actually and Ramons Divers they start a list of interested divers and run that list until it's full.
I.e when I got to Ramons on Wednesday, I inquired about the Blue Hole trip. They told me they had a boat scheduled on Friday and had 10 divers on the boat so far. It's such a long trip from AC, over 50 miles and 2.5 to 3.0 hrs. they wait until they get a full boat. If they don't have a full boat they will start to call the other dive shops/operators and let them know they have a trip planned, and the other dive ops, including Amigos Del Mar will send customers to Ramons or whoever (it could be the other way around) will be taking a boat out to Lighthouse Atoll.
The blue hole is a great dive. It's a bucket list dive, and you will hear this a lot. The other two dive are worth the time and every penny spent. Lunch was at Half moon Caye... what a awesome place to eat.
One note. If the wind is up, be prepared for a long crossing. Everyone one the boat was beat-up from the large chop, and wet from the spray and water coming over the fly-bridge onto the aft deck. I have been diving for a long time, and have been in heavy seas, but this was somehow different. However, the great diving, made the trip worth it. With that being said, I had the opportunity to dive Turneffe at the elbow the following week and I passed. I didn't want to make the crossing again.
Diving with Ramons at the Blue Hole, all the dive master on the boat were very professional. They explained in detail, what was going to happen on the BH dive, what we would see etc... A very specific dive briefing. They told us what they expected from us as diver, and what we would expect from then as divemasters. The divemasters were very thorough and professional.
At our safty stop they had two bottels at 15 feets with two-three regs set up in-case their were a few air hogs on the dive.