I just came back from
Disneyland, where I'd started to come down with a cold on my second to last day there. Here are the things I wish I'd thought to bring:
Medicine: For me, this meant ibuprofen, decongestant, and expectorant. Whatever makes you feel a bit better. There is a chance you won't be able to get it in the park, and if you do, it will be EXPENSIVE. It's easy to pack and if you don't need it, no loss.
Tea and honey: I love Gypsy Cold Care and rooibos tea when I don't feel good. You can make it in your room's coffee maker and have a nice hot cup to soothe the aching throat.
Good tissues: Even the nicest hotels tend to have rough tissues.
Juice: Okay, harder to pack, but if you can make a stop at a grocery store, get yourself some of the good stuff. The juice you find in the park tends to be the kid-friendly variety, which means more water and sugar than juice.
Also, when we're sick, it easy to convince ourselves that we can eat whatever we want. But it's a good idea to remember that good food will make you feel better, and bad food will make you feel worse. Particularly look for fruits and veggies high in vitamin A, and avoid dairy. (That part's hard for me. I LOVE dairy.)
Finally, if you're feeling poorly, take it easy. Spend some time in the park sitting in the shade and people watching. Go to shows. Take a nap if you're really feeling tired. I usually feel better first thing in the morning, but wear out easily. We'd get up for rope drop, have a few hours in the park, then take the middle of the day off. You'll feel better in the long run.