Hello Trina,
Welcome back to the Disney Parks Moms Panel! I've had the pleasure of staying at
Disney's BoardWalk Inn and absolutely loved it! There's so much to do and see around Crescent Lake, the hotel itself is gorgeous and I love the convenience of being able to walk to Epcot and Disney's Hollywood Studios.
A bus ride directly from Disney's BoardWalk Inn to Disney's Animal Kingdom Theme Park will take about 20-25 minutes. If you're sharing a bus with another hotel for that particular ride, that may add some additional time onto your trip (I'd estimate 10-15 minutes). Buses run approximately every 20 minutes, so just be sure to plan that time into your schedule, as well.
The unofficial site www.ourlaughingplace.com has a great tool to help navigate the Walt Disney World transportation system. Just look for the "Transportation Wizard" link in the upper, right corner of the home page. I use it all the time!
Wishing you a most magical visit to Walt Disney World, Trina! Please let me know if you have any other questions as you make your pixie-dusted plans.
Beth