Avista:
A thought on the timing of your Savannah & Charleston trips, if I may.
I took a trip (not Elderhostel) beginning at Jekyll Island, staying in Savannah and ending in Charleston, a couple/three years ago. We began on March 23 when the azaleas and virtually every other blooming bush were ablaze. Four/five days later in Charleston they were just short of in full bloom.
So - begin during the last week of March!
SWR