Hi, Cherise!
Welcome back! I hope you are enjoying planning your magical vacation to Walt Disney World® Resort.
Disney's Pop Century Resort and Disney's Art of Animation Resort are connected by a walking bridge that crosses over Hourglass Lake, making your journey on-foot between the two resorts very easy. However, there are no walking paths accessible by guests that connect either resort to Disney's Caribbean Beach Resort. There is a connecting road, but it is a Cast Member only through-way.
For an interactive map of Disney's Pop Century and Art of Animation Resorts, just select the highlighted link above. You can zoom in and out to for an "animated" lay of the land.
I hope this helps, Cherise! If you have any additional questions regarding other walkways between resorts, please do not hesitate to ask me. As an avid runner, even on vacation, I am well versed on resorts that offer guest walking routes.
Faith