Public Health Seattle and King County offers a comprehensive listing of community physical activity events, including bicycling, community service events, gardening, indoor events, outdoor recreation, parks, zoo, aquarium, walking events and local resources.
REI offers “Bicycle Maintenance 101” and “Basic Bike Maintenance for Women” free of charge at several locations. Go to http://www.rei.com/stores/index.jsp to search for a class near you.
and meet others who are interested in keeping hiking trails safe and accessible? Washington Trails Assocation offers volunteer opportunities to work on trails for most fitness levels. This is a great way to get involved. WTA also lists a hiking guide and resources for your trip. Don’t forget the 10 essentials.
American Trails lists resources for information and trails in Washington state.
With over 175 miles of regional trails connecting to hundreds of local and state trails, the King County region has one of the best trail networks in the nation. King County Parks and Recreation maintains the King County Regional Trail System site including trail system highlights, maps, and volunteer opportunities.
Boat
Kayak - renta boat and paddle the day away. rental companies include:
offers an 
Hiking:
With over 175 miles of regional trails connecting to hundreds of local and state trails, the King County region has one of the best trail networks in the nation. King County Parks and Recreation maintains the 