Sandy - Since Darlene hasn't answered your question, I'll answer since I also live in the Seattle area. You can easily see the following lights in two days with a rental car:

Browns Point - Tacoma
Point Robinson - Vashon Island (actually Maury Is)
Alki Point - Seattle
West Point - Seattle
Mukilteo - Mukilteo
Admirality Head - Whidbey Island
Point Wilson - Port Townsend
possibly Point-No-Point - Hansville on the return.

You'd have to take several ferries to do this route (I'd suggest doing them in the order I have listed). Take a look at a map and you should be able to see how to get to the various places including the ferry routes, highways, etc. It would also be a very scenic trip in much of the route.

Let me know if you'd like any further information.

Larry