We go the first week of May every year. This year May 3-17. Crowds are moderate, lots of school groups (Music Days). Perfect weather (a little hot), but my most favorite time to go. With Easter being last April this year, I am preparing for heavier than usual crowds. Like us, lots of folks try to avoid Memorial Day, so that only leaves a 3 week window for US May visitors. Still won't change my plans at all!