I am a travel agent but I don't do much in the way of day trips. When people ask me about them I usually send them to either AAA (there is one at Lake Sumter Landing or another by the Publix plaza at Spanish Springs) or JP tours (
Jp Tours in The Villages, Fl). Both of them do day tours around Florida. I have done a few of the AAA tours and they are pretty good. if you are here in the winter I would recommend the St. Augustine trip.