The turnoff to El Tecuan is about 10-12 kilometers north of the Tenacatita road with large signs.  All the beach property is owned by a development company including the abandoned old hotel El Tecuan which was closed down in the late 1990's.  Of all (there are many) wreaks of hotels along the Pacific coast, this used to be one of the nicest.   There were a few movies shot at the hotel and area which they used to close off to the public for the duration.
 

The drive into the beach is about 10 kilometers and the paved road is starting to fall apart.  In places it's reduced to a single lane due to the overgrowth.  Mango orchards, cattle guards and cattle are along the way.

Both ends of the beach are bound by river mouths and there is evidence of an old bridge that used to cross to the beach just north - Arroyo Seco.  During the dry season (winter) you can walk or 4-wheel across either the north or south ends of the beach.

There is sometimes good surf - but surfing, boogie boarding or body surfing there is not for beginners.  Steep beach with rips and undertows reported.