You crack open the cookie that cares:
Is this really a fortune? It's more of the cookie equivalent of "Don't Jump." Or Little Orphan Annie popping out of a cookie to sing, "The sun'll come out...tomorrow." Mei Wah has me on suicide watch.
"It can't rain all the time" was also the Prozac marketing campaign circa 1999.
(I know this because in the 8th grade I cut out that sun and used it in an art collage.)
As far as hiking goes - this little fortune means keep hiking, hikers! If it rains, if people cancel on you, if you had one too many at happy hour last night and can't bear the thought of the sun - just reschedule, let the rain pass, and keep hiking!!
Friday is only 4 days away. Don't jump.