I suppose it's a bit late to plan a short bicycle tour, but if you're traveling somewhere for the weekend, consider using a bicycle to get around, especially if you're visiting an urban area. A bicycle is the perfect way to get around the tourist areas of San Francisco, for example.
I'm sticking close to home this Memorial Day -- although "home" right now means flying 1000 miles to Colorado so I'm far from being conservationist. After that, though, will be house cleanup, chores, a church picnic this Sunday, and time with my family.
It's worth pointing out that Memorial Day is more than just a three-day weekend marking the start of summer. This day is set aside to remember those who died in the service of their nation. Remember them and their sacrifice.