You might want to consider the rain factor at that time of the year (April showers... ). We were at the Fort in early May this year, and there was some serious rain. This wasn't the summertime passing thunderstorm kind of rain either - we're talking torrential downpours for hours at a time. There were days of sunshine and only a couple of days of solid rain, but on most days our trailer was an island surrounded by a very large lake for much of the day. We were dry in a trailer, but I saw some very sad looking tents on that trip.