Glad the tennis shoes didn't give you blisters on top of your blisters! Can you tell what it was about the ASICs that caused the blisters? Just look for a shoe that doesn't have that feature, be it a high back, a seam at a certain spot, etc. I've got a great pair of Chucks that I want to wear to Disney because they have a padded ankle and a wide toe box, both spots where I tend to get blisters. But I wear ASICs in the parks too, because of the square shape of them, so not sure if Chucks will work for you. Maybe just make sure you wear the shoes for hours with lots of walking before the trip?