Bay seniors whose ideal hike is one that’s almost totally flat, might want to consider an end-to-end walk through Golden Gate Park. One is scheduled this Sunday, August 28 at 1 o’clock. It runs 5 miles from the park entrance at Haight and Stanyan and ends up 2 hours later at the Beach Chalet Brewery. Along the way you’ll hit Stow Lake, Strawberry Hill, a Ukranian Folk Concert and the gorgeous green gloom of the Park in summer. It’s free, of course. Dress warmly, bring water but no dogs. You can either make the return trip on foot or on the N Judah.