$ 300 RT to bring your sticks, yes? Plus the wild card aspect-expense & added joy of airline possibly damaging your board(s).
How long are you in-country? Anything less than 6 surfing days, rent. Esp HAW where boards are available. If it is more days than that in-country then it's a consideration to bring your own very-well-shielded board.
Of course, if you've got the excess coinage, then the debate is moot & you bring your honey stick(s).
Depends when ur coming. We just had a huge south swell, doh for a week, but that's very rare in the summer.. generally summer here is for Longboard and paddle surfing, but there's a shortboardable swell every week or two, but probably only shortboardable for a day or two...
I'd say leave ur board, and if a swell comes u can find an ok short board to rent here for $25 a day.
Also check www.surfnewsnetwork.com they are local surf forecast and very accurate., Like swellinfo is for the east coast.
If you barter or shop before you go, you can get good rental deals. Shops are everywhere on Oahu. I like Local Motion and another small one right in Waikiki. I've rented a long board for $125 for 10 days (soft racks included) in Waikiki. Much better deal than the hastle of packing, negotiating the airport and shipping. You can also buy a beater for not much more and leave it or take it home as a suveneir.
Went last October for 14 days, Bought a board there since i was in need of a new short board and flew it back. Bubble wrap it and for extra support throw cardboard in there. Also save room in your luggage and wrap your towels around the bubble wrap/cardboard.
Definitely take the trip to the north shore - like they've said you'll be surfing with 1/100th of the crowd and if you score it you will remember it forever.