We were on a private boat tour around the island when we visited, which I 12/10 recommend. They are reasonably priced for the experience, IMHO. Our tour guide, Luigi, was from Capri and knew everything there was to know from the history of the island to the best photo-ops. He also knew the slowest/busiest times to visit the Blue Grotto. He explained that most people take a ferry tour to visit the Grotto, which means, all those people on the ferry have to then switch into tiny boats two at a time to enter. As you can imagine this can take hours just bobbing in the ocean outside the entrance. Here’s the thing, most of the tour guides know the guys collecting the fee of €14 per person and this is where it really pays to be on the private tour. One nice little tip and a few minutes later we were inside this magical cave that looked like something out of a Disney movie. It’s very dark inside above the water, but the way the light hits the water makes it seem unreal.