Welcome aboard, Bernadette! I'm so happy that you've found the Disney Parks Moms Panel. I hope you have been able to browse the site and find answers to many of your questions, and of course we're always happy to help answer any others you might have!
I highly recommend booking any
Port Adventures that you'd like to experience as soon as you are able. Many are very popular and there is always the chance that they will be full before you the cruise sets sail, so it's always best to book right away if possible. Since you have a bit of time until you are able to begin booking, go ahead and take a look at all of the exciting options and see if there are a couple that sound like "must-do's" for your family, then plan to log on and book them once you are able.
Port Adventures can be cancelled without penalty up to three days before the cruise departs. If you know ahead of that that you won't be taking the adventure, it's nice to cancel sooner as a courtesy to other guests who might be hoping to get a spot on an adventure that is full. But, better to book now, even if you change your mind in a month or so. I'd hate for you to miss out on an exciting adventure because you had waited too long.
Don't hesitate to stop back with any other questions you might have as you continue to plan your fall sailing with Disney, Bernadette! I'm happy to help!