This is our fav spot, by far.
http://www.manakaimaui.com/
Been to many of the other islands, and other parts of Maui, but haven't found a better spot than this. Great beach, and great snorkeling right there, don't have to go anywhere else. We were there last this past Nov (about our 5th time at this location). Here is a little vid using a new action cam strapped to my head. Perfect beach, just enough surf for boogie boarding, but not too big to be dangerous. You can get the boogie boards at the hotel (free, just have to be nice how you ask).
https://www.youtube.com/watch?v=0vDfQQIGFQI
And this is what the snorkeling was like.
https://www.youtube.com/watch?v=tVtKUXjdW4I
Lots of turtles there.
Best price is before US Thanksgiving in Nov. After that it basically doubles, and the bigger 1 and 2 bedroom condo units with kitchens are sold out until later in Mar and Apr. Not sure when the price drops again, but probably later in the spring. Expedia will guarantee best price, so that is what we always use.