My suggestion is "Go with the flow". Most of the rides are closed during rain (heck, I rode WT front seat while it was sprinkling, and it felt like sleet :shock: ). If the rides close, grab a bite to eat or see a show. I laughed as I ate at Game Day Grille, watching everyone else on the midway panic. Heh, heh...
Also, they've recently gotten rid of Freeway passes for the remainder of the season. But, they've lowered admission by about $15 for adult one-day tickets, and even more discounted on the senior and junior tix.