A-5 Corp with its 45' slip is located in Honokohau Harbor in Kona Hawaii.  You can do fishing, diving, snorkeling and whale watching with your commercial/charter permit.  The night time manta snorkels or dives will soon be restricted to grandfathered in permits..But no body knows when the restrictions will start.  Would need to contact DLNR/BOR about that.  At moment there is no restrictions on the manta snorkel..  Maximum size boat would be 45'5" allowed in the charter permitted slip.