lifeguard, I feel ya.
A few years ago I took my parents to WDW for a day and after a lot of deliberation and trying to decide which of the four parks to visit, we ultimately settled on Epcot. We bought 1-day 1-park passes, and everything seemed fine. Once we got in, we noticed that Soarin', Test Track, and Mission: Space were all down at the same time. I was bummed.
Since World Showcase wasn't opening for a matter of hours, we were kind of upset and wished that we had just gone to the Magic Kingdom after all. So, we went to guest services and politely explained our situation to the CM. He was extremely helpful and gave us each a transfer ticket for the Magic Kingdom, basically telling us that the rides at Epcot would be up very soon, and that we could stick around until then and then use the new tickets to go over to the Magic Kingdom whenever we felt like it that day.
Basically, they'll be happy to accommodate you. If you don't make a fool out of yourself and can treat those folks like human beings, they're really helpful, understanding, and friendly. In our case, we basically got a free upgrade from a 1-park pass to a park hopper... for free!