I've been in both times, actually more often that first week in April cause it's my birthday week and I'm all about getting away on my birthday so I take a solo trip during that time. The weather is pretty good, I'm from Georgia so have had to wear a sweater during the early part of the day but otherwise, pretty good. I have been during college spring break time, which for my son was in March and it wasn't bad, I've never been during other spring breaks. As far as crowds, I would think it would be more crowded in April with Easter, spring break and F&G but it just depends on if you want cooler weather or possibly a little less people.