I took my kids (then DD7 & DS3) myself two years ago. We absolutely had a blast! Hoping to do it again this summer.
The only things that I found a little 'challenging' as a single mom was the nightly trek from the bus stop back to the room carrying a sleeping child. DS could never hold out until we got back. Luckily, I managed to keep DD awake, because I really would have been up a creek with 2 sleep!

Also, I think the rides could have been an issue if DS wasn't such a daredevil at the time and had no fear riding anything. Luckily he was a very tall 3, and was tall enough to ride everything, so the 3 of us rode together. Might not have been as much fun (for me!) if we'd had to stand in long lines for DD to ride things while I waited with DS.
If I had it to do all over again, I also would have asked more often for people to take pictures of all of us together. I just forgot most of the time, and ended up with a lot of great shots of the kids, but in retrospect I would have liked to capture more of the great time the 3 of us had together!!
At any rate, I just wanted to say that it is absolutely do-able! I hope you guys go and have a great time!