The original Puerto Vallarta Malecon/Boardwalk runs from Hotel Rosita to the Amphitheater and The Malecon Arches, right beside the main city square in Downtown PV. How long is the Puerto Vallarta Malecon then? It is exactly 2500 ft (760 meters) long.
More recently there’s a new section going from The Arches by the Dolphin statue to the Cuale River, which is called Malecon II (Malecón Dos or Malecón 2), by the river there’s a nice footbridge (wheelchair and bike-friendly) that goes over the river (also includes a lookout and foot access to the Cuale River Island) and into Old Town (Romantic Zone).
Even though it is a semi-continuous path, the real Malecon is the one in the historic downtown area, north of the Cuale River, actually north of the Naval Museum and The Arches, not by Playa Los Muertos as wrongly stated on important sites like Expedia and in Google Maps.