Hey doodler
your timing may be good as far as catching fish is concerned, but the weather has the final say-so. The earlier the better as far as I'am concerned. Things has changed in the last few years for crappie fishing- black as opposed to white crappie. If your not catching fish, then you are probably fishing to deep...black crappie can be found in shallow water right up next to the bank in 18" of water.
Also, the first part of April is KEA week, when all the public schools are out for spring break, a lot of people camping, so camping spaces are at a premium. Plan ahead...