There is a "path" but it is poorly marked , if at all, in places. It does not quite follow the coastline but is close enough most of the way.
I have done it in the past and although I did not measure it, it is a "stroll" of about 1 hour, but you do need decent footware.
If you click on the Forum map in my signature and "zoom in" on La Caleta you can just about pick out the route(s) to El Puertito.
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