Santo Tomas de Castilla. You can make the most of Santo Tomas de Castilla’s natural side at Las Escobas – a glass-like river where waterfalls tumble into a tucked-away stream. As swimming spots go, this one’s up there with the best of them. Head into Puerto Barrios, and you can sniff out a bargain at La Pradera Mall. It reels off restaurants, clothing stores, and a games arcade in its repertoire, and you can reach it in five minutes by cab.