Welcome aboard, Olver -
My favorite island,
Castaway Cay, offers a lot of activities that can pack your day. My family always starts off with a bike ride around the island. The Castaway Cay bike path is a flat and easy route. You can go at it at a leisurely pace, as you take your time cruising through the airstrip, all the way to the lookout tower and past Serenity Bay. Unfortunately, there are no Surrey bikes on the island. Those bikes at Disney's BoardWalk really are cool, aren't they? My family and I love taking those for a spin as well whenever we spend some time at the Epcot area.
As an option, you are able to pick an adult bike with a toddler seat to bike around Castaway Cay. You can strap your little one on and they'll love
biking around the island with you. There are also bikes with training wheels, as well as helmets of various sizes.
I hope this helps, Olver. Please do let us know if you have any additional questions as you prepare for your upcoming voyage. We're always happy to help.
Have a great day!
~ Dolly