Say yes to camping! Your kids will be begging you to go camping after this trip. Even if it rains, camping is way more adventurous than any other vacation. It will add a whole 'nother dimension to your WDW experience. Just know that staying in a tent is not the same as staying in a hotel. I know, that's obvious, but it's true. There are trade-off but it's apples-to-oranges. Really!
We were afraid to camp when my kids were little(11,5 & 3)--one kid was hyperactive, another didn't wanna get dirty, the baby was severely handicapped and couldn't walk or talk. How in the world would we do it? We bought a tent and some air beds, packed our pots and some water and off we went.
My one concession is I had to have an electric cooktop. I'm afraid of a Coleman stove, so my DH bought me a two-burner hot top and we have never looked back. We rig up a tarp over the cooking area so nothing gets drenched and cover everything with plastic while we're gone.
We have since moved up to a pop-up ,but my kids still love to camp. It's a great way to spend time with the family. My advice to you would be to give it a try near home before you "take on the road". You'd be surprised how quickly your kids will adjust to living outdoors.
Cathy--mom to John,18, Eleni, 11, & Christian, 9