Any individual who needs proof that the gay and lesbian traveler need the same things in their vacation as their straight counterparts should invest some time in Puerto Vallarta. The charm of miles of perfect sunny shores embracing vine-hung foothills, climbing above cobblestone roads, shops overflowing with the nation's best crafts, close to flawless climate, and a plenitude of extraordinary food and beverage offsets any contrasts — locals and visitors, of all ages, gay and straight, all lounge in sheer happiness here. In the past few years, a remodeled malecón that multitasks as crafts market, outside theater and . . .