Last summer,June, when I was in Kauai I used Fathom 5 Divers. They have a small group of six diver on their boat in Poipu. I love diving Sheraton Cavern for their morning and night dives! The only thing I didn't like was that I had to wait for them to get the boat in the water and snacks was chips/crackers/water.They also dive Tunnels which is a beach dive. I would recommend useing them for tunnels so you don't have to carry the gear. Also, at tunnel they divide you into groups depending on your level. I would only do morning dives at tunnel, night dive is messy w the beach sand unless you're renting gear. I'm not sure if tunnel is diveable in the spring beacuse of the waves. Also, when you're in Poipu there's an easy shore dive w a buddy at Koloa Landing. It's an old boat ramp w easy entry,but exiting be careful w the surge. Diving in Hawaii is expensive so make the most of it! Next year, I want to dive Molokini or Napali Coast area. I'm heading to Cozumel for spring break. Let me know how the dives is in the spring in Hawaii. In June, I wore 3mm full at 78F.