The Mason County Senior Activities Association oversees the Mason County Senior Activities Center and its two major funding sources, The Nifty Thrifty Store and the Pavilion. MCSAA was founded in 1981 as a 501(c)(3) non-profit charitable organization. Donations are tax deductible. The organization's articles of incorporation and by-laws are available at The Center. Mason County Senior Activities Center Our facility is 16,000 square feet. We are located west of downtown Shelton, WA at The Pavilion, 190 W. Sentry Drive. Individuals and groups take part in programs, activities and services which support their independence through health and wellness programs and encourage their involvement in the community. We are open from 8am to 4pm Monday through Thursday and 8am to 3pm Fridays. The Center is closed on most national holidays; see the Activity Calendar for details. Our Center is staffed by loyal volunteers who serve as receptionists at the front desk. Our building also houses the administrative offices of the Mason County Senior Activities Association.