Agree. And as to night dives, we had a great 98 minute night shore dive at Tikila a few years back that rivals any boat night dive we've done -- saw a ton of neat critters! (We had Jungle Divers guide us there, since we were not familiar with the site - highly recommend them!)
And when you and your buddy catch an octopus in the open, you can spend all the time you want on it without 6-8 other people all trying to crowd in.