Orienteering maps within the city limits of Seattle:
-Lincoln Park
-Seward Park
-Woodland Park
-Green Lake Park
-Magnuson Park
-University of Washington Campus
-Volunteer & Interlaken Parks
All of these would be better suited to ISSOM, but only one is (Green Lake).
Depending on when you're here, there could be a
traditional orienteering event,
Adventure Run, or a
Street Scramble.
All of the previous
'Hood Hunts, most of which have been in the Seattle city limits, still have maps and questions online, too.
Recommended day trips for out-of-towners: take a ferry over to the Olympic Peninsula. Or head up to Mount Rainier. Mt. St. Helen's is pretty interesting, too. Tons of trails at
Washington Trails Association, and they'll have plenty of seasonal updates (depending on how soon you come, snow will still be at some of the higher elevations).
Things to do in the city: Discovery Park & Ballard Locks, rent a kayak on Lake Union. It's touristy, but I like taking tourists to the Pike Place Market because it's actually a functioning farmers' market (as locals, my wife and I shop there). The Space Needle is overrated.