There are a lot of scrubby scraps within other parks or wildlife management areas. I myself live surrounded by a sand pine scrub in the Seminole State Forest. But I wanted this list to cater to classroom visits, accessibility, and availability of educational guides or rangers.
Go have a scrub adventure!
Archbold Biological Station in Highlands County offers a multitude of classroom programs and an Education Center. This is the best place to see a rosemary scrub. http://www.archbold-station.org/
Lyonia Preserve in Volusia County offers a wide range of classroom programs and an Education Center. http://www.lyoniapreserve.com
Enchanted Forest in Titusville, Brevard County –The name says it all! Group tours available http://www.nbbd.com/godo/ef/scrub/ or http://www.EnchantedForestFriends.org
Oscar Scherer State Park in Sarasota County - http://www.floridastateparks.org/oscarscherer/default.cfm
Jonathan Dickinson State Park in Martin County http://www.floridastateparks.org/jonathandickinson/
Ocala National Forest in Marion and Lake Counties. The biggest and wildest. http://www.fs.usda.gov/ocala
Lake June-in-Winter Scrub State Park in Highland County - http://www.floridastateparks.org/lakejuneinwinter/default.cfm
Jupiter Ridge Natural Area in Palm Beach County