Wert Bakeries #24 has a ride from Bothell to Snohomish and back on 39th.
Woods Northwest #89 has a similar ride that goes north on 39th and comes back on the east side of SR 9.
Another option is SR 527 – the Bothell Everett highway – which has nice wide bike lanes. This is a particularly good choice if you are heading for Martha Lake and the Interurban trail at 164th.
From the Sammamish River just west of the I-405 interchange, take the spur signed to UW Bothell. On the other side of the campus exit onto Beardslee and bear right as it turns into 195th and crosses I-405. Turn left on North Creek Parkway and follow it up to 240th (alternatively find the partially unpaved North Creek Trail in the brush and follow its more straightforward route.) At 240th turn left and then bear right on Fitzgerald. At the bottom of the hill jog right on 228th and then turn left on 29th Dr. SE and enter the Canyon Park business campus. Take the path of least resistance – 29th turns into 26th which goes left into 220th. You can make a right on 20th or just follow 220th west until it intersects the Bothell Everett highway where you turn right.
here is a link to a gmaps route from Blythe Park to Maltby Road
Here’s a link to a 30-mile Bothell – Snohomish loop – but you want to do this in reverse of the way it’s plotted out.