At any time of the year, one of the most pleasant and inspiring experiences you will have in Puerto Vallarta is a simple one: a sunset walk along the Malecón, the pedestrians-only waterfront promenade. Fabulous tropical sunset colors in the sky, dozens of quirky and beautiful modern art sculptures along the promenade, sand sculptures below on the narrow beach, and hundreds of crazily amusing people to watch. Free, fun, and unforgettable. I recommend taking a day trip to the Puerto Vallarta Botanical Gardens, an hour south of town. Wander the lush, lovely gardens, then swim in the river than runs through them.