Two tall-masted schooners rest at anchor in a blaze of Caribbean gold in this vivid chrome-era postcard titled Atardecer Caribe — Caribbean Sunset — shot at Isla Mujeres, Quintana Roo, capturing the kind of cinematic twilight that made Mexico's Caribbean coast a magnet for a new generation of adventure travellers in the early 1970s. The sender, writing from Puerto Juárez on Wednesday, March 7, 1973, recounts spending "two nights and three days at Cozumel," then venturing down the coast to the Maya ruins at Tulum — "neat ruins on the sea" — before discovering Xel-Ha, describing it as "a series of natural lagoons that were just beautiful for swimming and sky diving." The card, sent to a woman named Edgar's wife at 60 South Ave., Fairport, New York, bears a Mexican 80-centavo Correo Aéreo airmail stamp and a Cancún postmark — one of the earliest postcards to carry that now-famous resort city's cancel, as Cancún's tourist zone had only just begun development in the early 1970s.