I had not planned on going to the city this year, but am thinking about a spur of the moment trip Sunday/Monday this week. I thought about getting a season pass but remembered it would not be good until next year. What are the cheapest options for day tickets? I would think consider upgrading it to a season pass for next year if that is possible. Does anyone know what the cost is to upgrade a day pass this year to a season pass for next year? In years past I have bought passes well in advance and have never done the upgrade thing.