kidspot:
Alternating locations would be good - Both Airport and Kam III have good facilities - how's the diving at KamIII? - Makena landing is another option out your way too...
Old Airport is awesome in that it has both the diving and the facilities. Kam III has nice table and BBQ, and I can also book BBQ at Kam Sands condos across the street, but the diving is just so-so. Some nice snorkling areas and shallow diving around the rocky point between Kam 3 and Kam 2. For diving, there is a more interesting area off the left point, but it's a bit tricky to find your way around.
Due to closeness to Kihei boat ramp, dive flags really are needed at Kam 3, and the lifeguards enforce that rule. They don't know what a DSMB is and wanted me to have a real flag or at least a torpedo float when they finally caught up with me about the 4th time I dove it last year
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Ulua wouldn't work due to the parking situation. White rock has the parking and diving, but no BBQ or restroom.
Makena has decent parking and showers/restroom, but I don't remember any tables and BBQ. I'll have to take a closer look next time. Maybe Makena with a portable BBQ?
One other spot I'll check out is the area in front of the Prince hotel. There's public access from the south side, showers & restroom, and IIRC, some BBQs. Ive snorkeled there, but haven't really thought about it as a dive spot. Guess where I'll be diving later this week
Hopefully, somebody else (Ya back yet, Gilligan??) will jump in with some place that I've overlooked, like Cove Park or something.