Just FYI, as of this post, this year's STP (Seattle to Portland) is still open. The event is about a month away. Just a tad over 200 miles, the event is supported for either a one-day or two-day ride. Unusual to still see it open this late in the year as it normally sells out by now. It's a very large ride (10,000 riders when sold out). Not very hilly, so distance is the main challenge.