If you’re lucky enough to spend a winter or spring holiday in Puerto Vallarta & Riviera Nayarit, two neighboring destinations along Mexico’s Pacific Coast, then you’re in for a real treat. Of course, warm tropical weather, breathtaking beaches, gorgeous views, rich Mexican culture and a wealth of activities are a given any time of year. From November to April, however, you won’t want to miss out on the region’s Tianguis, or seasonal farmers’ markets, which offer a variety of organic and artesanal goods sold straight from local producers to consumers. Take your pick from from fresh . . .