Get your swimsuits out because April Pools Day(s) is Saturday, April 21st 2012 (one on the 22nd!) - Various times

 UPDATE: Found a complete list for Washington - see below.  Complete list can be found here.

Image courtesy of Seattle Parks and Recreation

• A one to two-hour program promoting water safety and life-jacket use. (Participants test their life jackets or use pool life jackets to learn safe sizing and techniques for swimming with a life jacket.)
• One hour of water safety instruction and elementary rescues.
• One-hour free swim. (The water safety and free swims have also been conducted concurrently as a two-hour program.)
• Raffle for free life jacket donated by Mustang Survival, free swim lessons donated by pool and other prizes too!

For more info. go here.