Weddingbee boards

My Grandma just called and told me after years of badgering. They just never celebrate it, which is fine, but I just wanted to know. What's funny is we actually talked about gettnig married today, but it'd be harder for everyone to travel on a Friday. What makes their annaversary so special is:

1. They raised me, so I love them my parents and grandparents.
2. They just don't seem like a couple who likes each other, but they stay together and wouldn't change it.
3. Everyone else in my family who has been married has been divorced at least once. (10 people related to me, 16 marriages, 13 (maybe 14) divorces, 2 (maybe 3) marriages.

They're special. Does anyone have any suggestions to do something special to do for them at our wedding?