Veteran Dance mom here. Op, you are thinking about this all wrong.
1. You are super lucky to have the option, but, if money is an issue skip it. If you have the funds it's not to be missed.
2. If you are on Dance Team you may have other opportunities. If not, then this may be your only shot. It is truly unusual to have an open invitation. .
3. This is not a vacation. It is an investment in your child. You are resume and skill building.
4. If you want to enjoy the parks, enjoy the parks. The event team won't let you anywhere near rehearsals or backstage. Go a day early or stay a couple days after to vacation.
5. You will love seeing your kid on stage. You might have more fun than the kids have on stage; but, do not make it about you. I've never regretted doing anything like this for my kids.