First of all, congratulations!!
We went in October with a two month old, a five year old, and a two year old. The baby was the easiest! The baby care centers in each of the parks are great - take advantage of them. It's a quiet place to take a break from the heat. They have a room with rockers and dim lighting where you can feed the baby. I can pretty much nurse discreetly anywhere, but this was a nice break for both of us. DH would take the other two on his own while I would stay there for about an hour. If you are using bottles, I did see mothers store the bottles in a refrigerator there. At that age, they nurse about every 2-3 hours. Even eating so frequently was not an inconvenience.I would feed him before we left in the morning, go to the baby care center for the next feeding, nurse him wherever we were eating lunch, I would nurse him during some of the longer, darker sit down attractions and nobody would even know I was doing it

. You will find the opportunities to nurse if you don't want to go back to a baby care center.
I was most concerned with the sun. I bought an attachable sun shade that hung very low over the front of the stroller and attached a stroller fan to keep him cool. I also brought a baby carrier and wore him a lot - he liked that, he slept most of the time. Make sure baby wears a hat and I tucked a lightweight blanket around the carrier to shield arms and legs from the sun. And this was an easy way to bring him on the rides. You can take baby on any ride that does not have height restriction. If you want to do any of the rides that the baby can't go on, take advantage of the baby swap, that's easy too.
A lot of the restaurants had the highchairs with infant seats attached, just bring a blanket because the are hard plastic. The ones that did not have a high chair allowed us to bring our stroller in.
Bring a blanket for baby because many of the restaurants and indoor attractions are cold.
I can't think of anything else right now, but if you have any questions, please feel free to ask me.
Good luck!
