My boyfriend and I will be going to Seattle for 7 nights (6/3-6/10). So far we are booked at the Sheraton downtown for the first 2 nights and then we are driving up to spend 2 nights at the Hyatt in Vancouver. We want to spend the last night in Seattle. Any suggestions on any places to go once we leave Vancouver on our way back to Seattle?

What's your budget? Many are getting great deals on Priceline for the 4 stars hotels. Also the Inn at the Market is a local favorite but is a bit more spendy. If it's only one night it may be ok? Plus it is right in the market which is great!

I figure you have two nights in the middle and lots of wonderful choices. The Northwest Cascades National Park east of I-5 is beautiful. The mountains are awesome with steep glaciated peaks.
Alternatively, going west, you could take the ferry from Anacortes and visit the San Juan Islands, staying in Friday Harbor a couple of nights. These are rural and small town islands.
Or you could take the ferry from Vancouver to Victoria, which is more urban, and spend a couple of nights there, and then take the ferry to Seattle. Wow! Great choices.

Welll..you could drive back down from Vancouver and over Deception Pass to Whidbey Island. Check out the Inn at Langley.(there are also many b&bs on the island) You could either stay on Whidbey for 2 nights or stay one then travel on over (via ferry) to Pt. Townsend on your way back to Seattle. Pt. Townsend is a sweet town and the ride back down to Seattle from there is a relatively easy one or just stay on Whidbey, take the ferry back to the mainland and head on down to Seattle. Any chance you can get to ride the ferries (with your car) will provide you a respit from driving and some knock out scenery.

I toured the area for 15 days last year around the same time and it was amazing. After you go to the Hyatt, I would recommend taking the ferry to Victoria for a few days. Vancouver Island is gorgeous. Take the British columbia ferry system http://www.bcferries.bc.ca/.
You do not need reservations and you drive your car right on and off. After staying in Victoria take the Blackball transport
http://www.cohoferry.com/ from Victoria to Port Angeles. When you get off at Port Angeles, you can take a short ride up to Hurricane Ridge in Olympic National Park. The view is absolutely amazing. When you get finished up there, it's about an hour and a half to the Kingston . Take the washington state ferry to Edmund
http://www.wsdot.wa.gov/ferries/
and then it is just a short drive to Seattle. About 30 minutes. This is a very good itinerary for a week.

Here is another idea. After Vancouver, it is an absolutely breathtaking ride up to Whistler. Which is a great ski resort. We were there last summer around 6/29. If you go to Whistler, the mountain will most likely not yet be available to take the gondola up for sight seeing, however, They are still skiing at Blackcomb mountain. The town is pedestrian since they ski in and ski out during the winter. It is really pretty with lots of shops and restaurants. It would be a pretty long ride back to Seattle from there about 6 /7 hours if you count customs. If I had to make a choice between the two I would opt for victoria. Hope this helps

The Victoria option is certainly a good one, and very popular.

Less traveled, but IMO a real eye-opener to first time visitors to the area, is a route that goes east from Vancouver, then south on the eastern slope of the Cascades, then back through the mountains to western Washington and Seattle. Travel east on the Trans-Canada Hwy to Hope, then cut over on BC Hwy 3 to Osoyoos, then south on US 97 either to Wash. Hwy 20 and west through the North Cascades NP, or farther south to Wenatchee and across Stevens Pass on US 2 via Leavenworth (yodel-ey-hee-ooo).

This route sends you through both the BC and Washington orchard country, you get to see sure-nuff cowboy (and Indians, too) country, red rocks, apple groves beyond belief, then a great passage through the Cascades back to Seattle. Overnight in Osoyoos or Omak; you'd have a great time.

Just want to thank everyone who replied. Great suggestions! The tough part will be deciding which to chose... I wish I had more time to do it all.

Thanks