There are a lot so fun things to do when you visit 
Manson, Washington. Some are local (hiking, biking, walking, swimming, fishing, water skiing, boating, canoeing, sailing, wine tasting, or just hanging out in the sun. Other activities are regional, like golfing, hang gliding, white water kayaking, cross county skiing, snow shoeing, snowmobiling, hiking, and down hill skiing at the local ski hill.
The Lake Chelan Chamber of Commerce is a great resource for information about What to Do Around the Lake Chelan Valley.
There are also spring, summer, fall, and winter Special Events at Lake Chelan.