Hi sounds great.
I was in kihei 2 or 3 weeks every winter for years my dive buddie from jersey moved there and i realy enjoyed alot of beach diving you don’t need to do a boat at all unless you want to dive lanai or molikini crater. The last time I was there was 2004 my buddy passed away so I’ve been going other places.
Some of my favorite dives are 5 caves, molikini,and Blackrocks (especially at nite). The dates you’re there you will hear whales singing all the time as soon as you put your head in the water.
Maui dive shop gives away a good pamphlet of the dive spots you will see them as soon as you enter kihie.
I really enjoyed snorkelling off of kalama park 3 right in front of kamali sands condo’s in kihie. I got a picture of a frogfish and always saw octopus there. Always lots of cool fish there too. Dive as early as you can because vis goes down later in the morning because the winds pick up and churn it up.
Hope you have a ball. Dennis