If you're set, Puerto Vallarta area would probably have everything you're lookinf for while also being one of the safest destinations in Latin America.

PV, to Sayulita, San Pancho, and go no further than La Peñita. Try to sign up for some sort of group travel for safety. It should be fine, but you're a solo female so...

This area is a bit tourist spot so you may not get the authentic Mexican experience, but it is generally much safer than going to other areas.