So Molokini seems to be the place to go snorkel. Most of the charters seem to start pretty early in the morning, but some also offer afternoon tours that are shorter and cheaper.

We'd prefer the afternoon tours since a few in our party are more interested in the boat ride and won't really be snorkeling; plus we're not really into the idea of snorkeling for 5 hours like the morning tours normally do.

Question is do these tours really happen or do the trade winds prevent it? Can you see anything during these afternoon dives or does the water become too choppy? If it matters, we're going at the end of August/early September.

Seems like the dive site should be sheltered, but a few sites have mentioned that these afternoon tours often end up at a dive site other than Molokini due to the weather.