Up in the pass proper there's actually very few roads at all.... There are some forest service roads that tend to be packed gravel/dirt that are rideable on a road bike with wide tires. (I'd get some Green Trails maps if you are interested in those) I'm guessing you are staying at Denny Creek? That's one of the few paved roads other than the interstate up there.

You can also ride on the Iron Horse/John Wayne trail, though there are spots where the gravel gets a bit deep! If you like to ride passes you can go a bit east to Cle Elem and do Blewett Pass. Old Blewett is closed to car traffic, but the surface was pretty rough when I was there 6 or 7 years ago, so I'm not sure how it is now.

If you head down to North Bend you find more paved roads and some nice farm country

To be more specific than that I'd want to know a few things - how long are you looking to ride? Do you like hills or would you want flatter routes. How much tolerance do you have for traffic? How far do mind traveling to get to your ride?