My friend and I are in our late 50's - 60. We are wanting to tour the Oregon coast and i'm not sure how long to plan for. We will fly into Portland spend a night and rent a car. We are not hikers, mainly sightseers and some shopping with good food and lodging with great views. We have from 5-8 days. We do want to go from Astoria all the way to the Redwood Forest, then back to Portland. Any suggestions?