We originally passed right through Guaymas.  Supposedly one of the principle seaports in Mexico.  We drove through town trying to find the lovely shorelines and resorts we had read about.  We had to turn completely around and drive back in to find it.  Eventually we found a shoreline and some very vulgar local punks.  They started as a great way for me to practice my spanish.  Eventually it digressed to sexual innuendo and panhandling.  On the whole, not the experience i hoped for.  I don’t recommend.