We really enjoyed using the baby centers- be sure to stop in!!! Be sure to dress your LO properly; we were there in December,, and it was much warmer than we expected- I packed mostly shorts for my DS, which was fine, except that he was too little for sun block, so we had to keep him covered up and our of the sun. I recommend some bucket hats too. We're headed back this weekend, and our DS is still too young for sunblock (pediatrician says 6 months), and looking at the weather I plan to have light pants for him (and I will probably bring shorts too). We did have light blankets so he could be covered and not too hot.
This trip was also the first time our DS slept in a PnP- he has since slept in one at his grandparents' houses- and I would suggest bringing your own PnP sheet...and maybe giving it a spray down with Lysol. Our DS ended up getting a little tummy bug while we were there, and I'm not sure that this was the culprit, but I don't want to take any chances this trip.
Take lots of pictures, and don't be afraid to take your LO on some rides!