Depends on priorities. My families priorities are without a doubt low crowds above all else. So we go last week of January and first week of February. Crowds are very good, but usually 2 to 3 major rides could be under refurb. Over 3 visits we've never ridden Kali River, and splash was under renovation 1.5 of the time. Also only one water park will be open. Weather is also a little cooler, we're Canadians and are perfectly happy going swimming all day at 65 to 70 degrees though so it works for us!