The crowds are very manageable and the weather is really perfect for theme park touring. We have been the first week in May three times now, 2012, 2013 and 2016. The highs and lows have been anywhere from mid 70/low 60's to mid 80's/70's. On two of our trips it has been cooler than "I" was expecting on a day or two. Not cool by most standards I'm sure, but in the low 60's by sundown. In the evenings I've seen a ton of toddlers with $30 sweatshirts because all they had packed were light weight tank tops, shorts or sundresses.