In January, Typhoon Lagoon will be the only water park open. We go every January, but have yet to make it to a water park. We had AP for the last few trips, and they didnt include the water parks. If you had weather like we had this past January, you better bring your ice skates!! hahaha We have had hot trips in Jan ( upper 80's) and very cold trips in Jan ( woke up one morning and it was 28 degrees. that was this year). The parks close very early in January too. If you are going for a long trip and you have nice weather, Id do it. If you are there a short time, I personally wouldnt waste a day at the water parks. Id rather do the theme parks if I only had a few days, but thats just me.