Lots of snorkeling companies in Hawai'i. You will have lots of competition! Many of the boats are specifically designed for this purpose...no berths, no galleys, open seating and decks. Very simple affairs. On O'ahu they take the form of small
power boats, mono and multi
hull, most about 28 feet or so and a passenger capability of around 15 passengers. On Maui they tend to be larger for the run out to Molokini Island (60 feet and bigger) and most put on a BBQ type affair. Many carry well over 50 people.
Problems with this....
1) You will have trouble finding a place to put your
boat. The waiting list is 15 years for a mono-hull slip. A big cat will have even bigger trouble finding a spot.
2) State of Hawai'i requires a PUC
certification. This takes considerable effort and time to get.
3) The US Coast Guard are nearly Gestapo like in Hawai'i, especially in regards to anything
commercial. If you want I will reply with the horror stories. Suffice that the Coast Guard is a MAJOR problem and drives many of these businesses bankrupt. In addition...if the boat is not in
commercial service you will find it will cost an incredible amount of
money and time for the Coast Guard to approve it. Incredible. If someone gets hurt, or you get into a minor scrape, or a host of other reasons, you will get your
certification pulled for months, or forever.
4) The primary tourist in Hawai'i is Japanese. Providers of attractions to the Japanese tourists need to be certified by the Japanese tour agencies. This is a difficult process, especially if you aren't Japanese, which limits your clientele dramatically. Your partner in the
hotel industry can explain this and help in this regard.
Best bet...buy an existing business and boat, they go up
for sale all the time. Make sure the slip is transferable (most aren't). Make sure the CG certification is good and there is a PUC from Hawai'i. JMO