​Amboy Territorial Park was established over 50 years ago to celebrate the 75th Anniversary of the first Amboy Post Office (established in 1886). Amboy, Washington was and still is an unincorporated town in Southwest Washington. The Park is home to Amboy Territorial Days Celebration which is held every year over the 2nd weekend in July. This event is hosted by the Amboy Territorial Days Association, a non-profit, all-volunteer organization that owns and manages Amboy Territorial Park. Other annual Park events have included the Lions Easter Egg Hunt, Veteran's celebrations, Horse Shows, Christmas Festival of Trees, and more. ​ Park Details: Beautiful Park grounds, play areas and well-maintained restrooms are open to the public daily. A large pavilion with full kitchen facilities, two buildings, stages and a horse corral are available to be reserved by local groups and organizations for family reunions, company picnics, weddings, music festivals, horse shows and more.