Air Maui and Pacific Helicopters are the only 2 companies I know of doing doors-off in Maui. Save your money for Kauai if you want to do a helicopter tour though - Maui is pretty average in comparison from a helicopter standpoint and it's ~30% shorter duration and way more expensive just because it's Maui. You're looking at ~$450 CAD for 45 minutes or less. Look up their safety records on the NTSB, I haven't personally used either company. Blue Hawaiian is even more expensive ($~500 CAD), and they don't even do doors off - you're paying for their EcoStars and if you get one of the 2 middle-back seats (you don't get to pick) you will see nothing. You don't want a helicopter with windows unless you want to look at everyone's reflections and not take pictures - they are quieter and more comfortable though.
I dove with this company in Maui a few times:
https://www.lahainadivers.com/
I think the "Maui Reveaed" guide book has them as the top pick. We did shore dives and a Molokini crater dive. The crater in general is a giant tourist trap, crowded, and just about everything is dead from suncreen and tourists stomping on the coral, not worth it IMHO. You could hear the whales under the water which was neat but not worth the price of admission.
The dives were OK, nothing special. Hawaii diving in general just isn't very good to be honest, and it's ridiculously expensive for short dives. I've done dives on Maui, Kauai and Hawaii - I probably wont do it again.
Spend your money on whale tours and look no further than Captain Steve's - I tried 4 different companies with 4 different craft, and he was *by far* the best in all aspects, and cheap:
https://captainsteves.com/
I've only done deep sea fishing on Hawaii, so I can't help you there for Maui. It's very expensive but the way to go is get a group together and charter a whole boat for the day. If anyone is easily sea sick, warn them - remember that only a little ways off shore it's like 3000ft deep and you're basically in the middle of the ocean.
Honestly just follow this book for the Road to Hana and you won't miss a thing:
https://www.amazon.ca/Maui-Revealed-...gateway&sr=8-1
My 2 favorite things to do on Maui by far are hiking the Haleakala crater (don't bother going up for a sunrise, and you have to book it now too I think), and whale watching every morning.
This also makes for a good full day adventure if people are looking for something to do:
https://sailtrilogy.com/tour/discover-lanai