I like to volunteer on Mauna Kea, so I can enjoy their fabulous dinner for free. This year, I got invited to a friend's house, so I won't be doing it then.
When I lived in Silicon Valley, the day after Thanksgiving, the Stanford Outing Club would host a "Walk the Turkey Off" hike. It was 8 miles through the Santa Cruz mountains. Afterwards, we would attend a contra dance in the Felton Town Hall. It was the ideal celebration for me - feast, then walk / dance it off.