Hi Diane and welcome to the Disney Parks Moms Panel.
It's always lovely to be able to answer a question from a fellow Brit.
No, it is not possible to take a boat from the Magic Kingdom Park to Disney's BoardWalk Inn Resort. The
Walt Disney World Bus Service would be your best bet in this instance.
The Magic Kingdom Park is accessible by boat (also known as water taxi) from:-
Disney’s Grand Floridian Resort & Spa
Disney’s Contemporary Resort
Disney's Polynesian Village Resort
Disney’s Fort Wilderness Resort & Campground
Disney’s Wilderness Lodge
Epcot and Disney’s Hollywood Studios are accessible by boat from:-
Disney’s BoardWalk Inn
Disney’s Beach Club Resort
Disney’s Yacht Club Resort
Walt Disney World Swan Hotel
Walt Disney World Dolphin Hotel
You can read more about
Complimentary Resort Transportation and the
Walt Disney World Water Transportation on the Walt Disney World website.
Wishing you a magical holiday filled with memories which will last a lifetime!
Emma