The trail along Shevlin Park is completely flat, easy, and stunningly beautiful as it skirts the Tumalo Creek drainage.
It is for all comers (walkers, bikers, families, dogs). The sounds of the large creek make you want to sit and meditate or just take in the scenery. The further you go from the trailhead, the fewer folks you see.
You'll find plenty of parking at Shevlin Park Trailhead.