I would say it depends on which building you are in and how old your kids are. From buildings H and J, it takes me about eight to ten minutes to walk along the road (paved streets) to the beach at a leisurely pace. As you go up the alphabet to A, it will be a longer walk despite being geographically closer to the beach club because the road takes you out the other direction. You could, in theory, take the lava rock Fisherman's trail along the edge of the land for a more direct route from those buildings, but would absolutely not do that with kids under maybe 11, and even then only if your kids are pretty athletic and good with rugged conditions. Also remember that you are likely to be walking in the heat. You could absolutely push a stroller from the buildings closer to the Point's exit to the beach (and from the other buildings, too, depending on what you find to be a reasonable walk in the heat, but I would not walk with kids (not in a stroller) under maybe eight. It all depends on how used to walking your kids are. IMO, no way with toddlers!

It probably depends on how you book. I booked through Hyatt using points so there wasn't one.

Yes... the beach club has good (not great) snorkeling.. it's also protected from big surf

napua restaurant is easy walking distance, and the Mauna Lani Hotel has some good restaurants within walking distance.