The next day we would buy our supplies (water/snacks) at the stores "across the street," then head off to Hana where we do have several nights booked.
I've always wanted to do that, or stay at the Huelo Flower Farm. I'd have no issues staying in a Days Inn quality place for one night.
BTW, if you like to boogie board, I'd recommend buying some boogie boards in town before heading to Hana. Hamoa Beach, right past Hana (and used by the Hotel Hana) has some of the best surfing on the island. Not sure I'd take young kids, though, because the waves were powerful enough to knock my 5'10" 175 pound husband down.
Report back about Hana if you can. I'd love to know what you thought of it.