I grew up in that area. There are sooo many great areas to ride and visit. Frankly I have always regretted leaving and have been looking for a reason to go back.
Take 99 north to Corvallis, cut over to Philomath and head to Newport Bay, then ride down the coast to Florence and cut back through to Eugene. It is a great way to spend the day
If you head north out of Newport Bay you can ride the coast through Depot Bay and up to Lincoln City. Great place to spend the night and then head to Florence the next morning.
Enjoy and please post pics for those of us less fortunate