I also found the holiday weekend for January to be busy a few years back. Also the February week with Valetines Day and ending with Presidents Day holiday. Insane. Last year we went the first week in May and the 3rd week in September. Wonderful crowds. September was very hot; May, not so much. (September was unusually hot last year, though). I don't know that I'll ever do January and February again - weather and crowds too unpredictable. The mid to latter part of February isn't bad, though.