Congrats!
Take it easy in Sept... you don't want to worry about anything you may have done to the child if you ride a bumpy ride or whatever.
Remember, the park will still be there when the little one is ready to go with you, and then you can enjoy it in a whole new way.
I just had my daughter 11 months ago and I am already counting down until I feel like I can take her to the happiest place on earth. It's a special gift to be a mom. It's hard work, but it's worth it.