Yeah Easter week will be sky high crowds but gorgeous weather most likely. August will have lower crowds but atrocious weather. Tough call. There are a lot of threads on here about August weather if you search. It's bad. It's not just hot. It's the hottest hot and the humidity feels deadly. And the daily thunderstorms can wreak havoc with the afternoons. I would be very honest with yourself about how your crew will do in the extreme heat. Some people do fine, some can't deal.