My home dive shop, in Santa Clara, CA. A great place to buy gear and take classes (from me, even!)
California - South
Truth Aquatics
Three of the best dive boats for multi-day Channel Islands liveaboard trips.
Psalty Adventures
They've got a smaller, fast boat ideal for day trips to Santa Catalina Island.
Hawaii
Kona (big island)
Big Island Divers
Great diving up and down the Kona side of the island, including manta ray dives.
Jack's Diving Locker
Jack's was the first dive shop to do black water ("Pelagic magic") dives in Kona.
Aquatic Life Divers
One of my divemaster friends started her own business in 2017. She's excellent at finding critters. One of the most conservation-focused dive shops I know. And they just got two new custom-built dive boats.
Maui
Lahaina Divers
My favorite dive shop in Lahaina, on the west side of Maui. Their boats go to Maui, Molokini, Lanai, and Molokai (hammerheads!)
Kauai
Fathom Five
Smaller boats mean more personal service.
Oahu
Reef Pirates
They own a 6-diver boat in Hawaii Kai on Oahu. Much more personal and easy-going than many of the bigger (and more crowded) boats on the island.
Close to Blue Heron Bridge for epic muck diving, and good dive boats.
Roatan
Day boats out to the walls, and a great house reef for night dives.
Spectacular muck diving and reefs. Small boats; very photographer-friendly.