The fare is now $2.65. Hopped on this bus recently. Large luggage rack aboard, and only takes about 20 minutes from the last Miami Beach stop. Not only is this the Stellar way to reach the airport, but it ends at the new airport Metrorail/Metrobus station where you can connect with buses going south to Coral Gables and Coconut Grove or north to Miami Springs and Hialeah.
You can hop on Metrorail to Downtown Miami. You can also take buses 42 or J to Greyhound six blocks away or walk there if you want.
Sometimes City Hall does come up with good ideas and money well-spent.