Our family of 6 is going to Kauai for a week, then to Maui for a week this summer. We all want to boogie board (body boarding). If we buy boogie boards on Kauai (instead of renting them) how do we wrap them up and check them as baggage on the island hop flight?

I would just rent them.

You might have to pay baggage to get them on the plane.

Agree with Placename. You can call the airline, but I bet they will charge a hefty fee for each board to Maui and then another fee for each board to go back to the mainland. Renting sounds cheaper.

Buying boogie boards and discarding them will be cheaper than what the airlines will charge you to get them on the plane. Trust me, I know from experience.

I'd rent. With the thought that it will be easier than trying to transport between the islands & also Hawaii really doesn't need any more boogie board left behind.

Have you ever boogie boarded in Kauai?
They are lots of shore breakers and you need to be extremely pro to be doing that kind of stuff.
It's what kids with broken necks and paralyzed will tell you.
I find Kauai to be the most unfriendly on water sports of all the islands.
Tunnels and Anini are wonderful though but mostly for swimming and snorkeling.

FYI - If you are staying in a condo, it may already have boogie boards.