Not for hotel, but we got the recommendation of Lucy's Taqueria in downtown Hilo on our way to VNP, and it was awesome. Absolutely fantastic. It's kind of like fast food, but it's not ... they have a photo of a newborn baby next to a photo of their burrito ... pretty funny, as the burrito is bigger! My kids still talk about the food, and that's saying a lot. It was SO GOOD!!! Everything so was super-fresh, and they were helpful as we were there during lunch, and it was obvious we had NO IDEA how to order (or what to order!).
Our fave island is the Big Island. Hawaii Tropical Botanical Gardens is one of the most spectacular places on earth. Seriously.... go see it. Just a short drive from the hotels in Hilo. We MUCH prefer the other side of the Island for hotels. The Fairmont Orchid is spectacular, and we'll stay there again on any "next" trips. We've stayed at the Hapuna Beach Prince HOtel too - and that was lovely, but more for grownups than kids.
It's worth driving to Kona - hit up a coffee plantation or two. Hula Daddy is our favorite. TJs BBQ by the Beach in Kona is AMAZING. It's in a dive shopping area, it's a stand, but there's a reason it is so highly rated on Trip Advisor.