Hi Julie,
Thanks for visiting the Disney Parks Moms Panel with your question. My family and I have been on the
Pirates and Pals Fireworks Voyage several times and we love it! My daughter was slightly older than yours on her first voyage and she was perfectly fine. I was a little worried because she did go to bed early, and I wasn't sure if she could make the later time, but she was a trooper!
My advice to you would be to make sure you head back to your Resort for a nap or some down time during the day. That way your toddler will be ready to go for the evening experience. There is also plenty of snacks before boarding the boat, so your toddler may be distracted by the food, and not realize how late it actually is.
In terms of strollers, they are not permitted on the boat however we were given two options. First we could leave the stroller at Disney's Contemporary Resort before the Voyage, or we could take the stroller to the boat launch and they would store it on the back of the boat (this is the option we chose so we didn't have to walk back up to where our stroller was left, that way we could head right back to our room once we returned to the dock).
I hope you have a magical time on your Walt Disney World Resort vacation Julie. Please let me know if you have any more questions while planning. I would be happy to help.
Stephanie