Salem Lake has some fantastic views, nice shade from the sun, and a great trail for the family. The trail is great for biking, running, or a nice leisurely stroll. Bring some water, the trail is about 8 miles as a loop. There is parking at either end of trail if you would like to chop it up some.
This is a pretty quick grab off the trail, carefule that "joggles" (jogging muggles ;) ) don't see you snooping around.