I'm planning to rent a car in Florida for one week, and drive around the state (Orlando, Everglades, Keys, Palm Beach, back to Orlando). Rental companies I've looked at, including Avis and Budget, have cars equipped with electronic toll transponders so you can get through the fast lanes in exchange for a daily fee (they charge a fee in addition to the tolls themselves: around $4 / day, with a $16 / month cap).
What I'm wondering is: in the areas I'll be driving around, can I opt out of this scheme and pay cash at the tolls, or will I find myself on roads that require electronic toll (cashless tolls)? And more generally speaking, does it makes more sense to opt in, or opt out, of these schemes?