Jerbear's routes are ones I frequently take and I agree that they are nice for getting out of NE while still being on somewhat of a trail system
One other route is to take 22nd Ave to Monroe to 19th Ave to the
18th Ave Bikeway to Marshall to the Plymouth Bridge to WWR/Cedar Lake Trail
It's not as scenic as Jerbear's routes, but at least the 18th Ave Bikeway provides somewhat of an off-street opportunity