Capris would be too hot for me, but if you feel better in them go for it. Maybe you could pick up some of the longer Bermuda shorts that are popular right now, they would be shorter than capris but would cover more. I know what you mean about the thighs, mine are not quite as firm as they used to be, BUT at WDW there aren't many supermodels! And no one will be paying attention, we are all looking forward to having fun!