If you know you can get a decent rental....rent. I've done it before with glassed on fins but I'm always sketched out and my boards ALWAYS get beat to hell even though I take extreme precautions. Save 300 or 400 bucks.
United is pretty expensive to travel with boards I believe...if cost isn't a factor I would bring it otherwise just rent...plenty of places down there. As for me, I always bring my own board when traveling...I would check out thus thread if you decide to do so: link