I once visited the Everglades in April, and it was really too late in the season: the wintering birds had begun to move north, and the dark swarms of attacking skeeters, especially early and late in the day, were a sight to behold.
Marshes are more full of life than any other sort of geography, which is probably why they appeal so much to me.
Despite the skeeters, for birders there is nothing better. Sad that I never saw a Snail Kite, though.
For your nature trips, the NY Sun agrees that winter is best for the 'glades.
Photo: Big Cyress National Preserve in the Everglades.