Welcome to disABILITIES.
First of all the GAC isn't a pass (and the only reason I am mentioning that when you think of a pass, you think of a pass allowing something and that's not really what it is). GAC stands for Guest Assistance Card and it actually is a
tool to let the Cast Members (CMs) at the attractions know what sorts of accomidation/assistance is needed by someone with invisible disabilities.
You go to Guest Serices and explain what your needs are. The GACs are all stamped with different icons, giving information on what you need. In your case, you need to have a place to wait out of the sun and to avoid stairs. Do your best to explain what difficulties/needs you expect and they will do their best to help you get your needs met.
One of the best ways to avoid waiting for long periods is to use FastPass. You didn't mention whether you are going with anoyone besides your girls or how old they are. But, if you have other people in your party or your girls are old enough to do the running and get Fastpasses, you can expend a little less energy yourself.
For the immune problems, there really isn't a lot a GAC could help with. You will be in a very crowded area with lots of people. Even if you got a GAC that allowed you to wait in less crowded conditions, it's still pretty crowded. I would suggest carrying one of the alcohol based handrinses (like Purell) and use iot often.
No one will reprimand you about choosing not to use a wheelchair or
ecv, but we do mention them to people who don't want to use them because most people who have not been to WDW before just don't have any idea of the distances involved. When I think of walking to the high school my daughters attended, it seems like a huge distance, but when I measure the distance with my van odometer, it's only a bit over 4 miles. I've read that the average person walks between 3 and 8 miles a day at WDW.
Anyway, if you don't want to use a wheelchair or ecv, then it becomes really important to look at your energy like a checking account. During the day, you will be spending energy (and hopefully saving some too). if you overspend on your energy account, you already realize you will pay the next day, so you have to plan not to get overdrawn.
- So, the first thing is to some planning. Even people without health problems can't see everything, especially during Spring break. Plan with your daughters the top couple of things in each park you want to do. if you each see a couple of things you really wanted to see, that's better than rushing around and trying to see everything.
- Plan your day based on how you feel. Touring plans say to go to the parks early to avoid the crowds, go back to your room to rest/swim and then come back to the parks later. That's fine if you are good in the morning, but a some of people with arthritis feel better later in the day as they get a little looser. You know when your best times are; use them for the parks and you will probably get more done and feel better than trying to make your body fit a plan that's not right for you. (It's not so hot this time of year that the time makes as much difference as in the heat of summer).
- Pick up maps and use them. What do you really want to see and wherre is it in the park? What else is near it?
- At MK, use the trains to avoid walking. You can use the train to get from Main Street to Frontierland if one of the ride you want to go to is there. And, if the next really important thing for you is in Fantasyland, it might be less wear and tear on you to take the train to ToonTown and then walk the short distance to Fantasyland.
- Consider the energy cost of the ride. SOme of the rides are going to be more restful than others. We find MK very un-restful because most of the attractions are very short and it's a lot of work to get our DD out of her wheelchair and into the ride seat (especially for a 2 minute ride). Do some of the ones that require a lot of moving in and out when you are feeling the best if you can.
- If your girls are old enough, let them do some of the standing in line for you. Are they old enough to order the lunch for your group? If they aren't, they might be old enough to purchase some of the simpler things like an ice cream or popcorn snack from a cart while you are within sight the whole time. That way, you might be able to sit and rest for a few minutes while they spend some energy.
- Realize that it's going to take a certain amount of energy to get back to your hotel. If you are already overtired at the time you leave, you will really be in tough shape when you get back to your hotel (and you'll really pay for it the next day.
i can't really think of anything else off-hand right now, but I'll keep thinking.
Good luck and here's some pixie dust for a great trip.