You can light rail to downtown from the airport (University Street Stop) and then Hire a car or catch the 25 Bus South to Camp Long for the Wedding on Saturday.
Hotel
The Grove West Seattle Inn
3512 Southwest Alaska Street Seattle, WA 98126 (206) 937-9920
Hotel
Chittenden House Bed and Breakfast
5649 47th Avenue Southwest Seattle, WA 98136 (206) 935-0407
Hotel
The Gatewood Bed & Breakfast
7446 Gatewood Road Southwest Seattle, WA 98136 (206) 938-3482
Hotel
Georgetown Inn
6100 Corson Avenue South Seattle, WA 98108 (206) 762-2233