This is the first time I've been on this side of the board. I just happened to see the title of your thread.
My husband and I separated in February. We have made many trips to Disney over the years. For a very long time I have wanted to take the kids camping at Fort Wilderness. He was never interested. So I took my kids to the Fort in July. It was my first time camping and my first big trip without my husband.
We had a great time! It was a lot of work, the camping aspect was a challenge. But the kids had an absolute blast.....it is Disney after all!
I will admit that there were a couple of times that I got emotional. At times it seemed that everywhere I looked there were moms and dads with their kids (which made me feel sad that their dad was missing). And of course, there were reminders of our previous trips when we were there together. Honestly, I didn't think it would effect me that way. I thought the kids and I would be too busy enjoying the park to think of anything else.
There is no way to predict how you will react. I think it all depends on your frame of mind. I say plan the trip with your daughters, try to make things as normal as possible, create some new traditions, and make some great memories.
Hang in there! And good luck.