Playa Conchas Chinas (Chinese, or “Curly,” Shells Beach) is not one beach but a series of small sandy coves dotted by rocky outcroppings beneath the condo-clogged hillside that extends for about a mile south of Playa los Muertos [1].
A number of streets and driveways lead to the beach from the Manzanillo Highway 200 (the extension of Insurgentes) south of town. Drive, take a taxi, or ride one of the many minibuses marked Mismaloya or Boca that leave from the corner of Constitución and Calle Basilio Badillo, or hike along the tidepools from Los Muertos.
Fishing off the rocks is good here; the water is even clear enough for some snorkeling. Bring your own gear, however, as there’s none for rent. The usually gentle waves make any kind of surfing very doubtful.
Links:
[1] http://www.moon.com/destinations/puerto-vallarta/puerto-vallarta/beaches/playa-los-muertos