Most Miami Beach access points have terrible sand wheelchair situations, but 13th Street and Ocean Drive has a proper beach wheelchair program. Free beach wheelchairs with wide tires that actually work in sand, plus a wooden boardwalk that goes almost to the water.

Available 9am-5pm daily, just ask the lifeguard station. They also have an accessible changing room and bathroom right there. 5th Street pier also has decent access but gets more crowded.

Ocean Drive itself is still rough with uneven pavement, but once you're on the beach the access is genuinely good.