Depends on what you are looking for..
Santos is not one of "our" trails it is maintained by the OMBA, Ocala Mountain Bike Association, however, at Santos there is some freeriding areas, some REALLY good technical areas, all in all you can easily get a 30 or 40 mile ride in if you want..
Croom = Is a great trail for spinning.. Trail is difficult this spring because we haven't had a lot of rain so its very dry... easy trail to get 40 miles + This is where the club does the 50 mile offroad endurance challenge....
Alafia = Is a great trail period. Only down side is there is not enough of it.. Some good technical stuff, some fairly technical stuff, and some fast free flowing stuff..
Or Boyette = Another great SWAMP trail, has some moderate technical stuff and about 20-25 miles of nice singletrack. Great trail and it's never crowded..
Well thats my two cents..