It depends on what parks you are talking about. But general rule of thumb, outside coasters may go down, but it also depends on how much rain and if there is any lightning within a certain distance. At MK, this means Mine Train, Splash Mountain, BTMRR, Barnstormer, and possibly a few others that I'm not thinking about. Everything else that is inside should be ok. There's still a good amount to do, but it does depend then on what your interests are.