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Antigua's best volcano expeditions are offered by Eco-Tours Chejos, whose friendly owner has climbed Volcán Pacaya more than 1,800 times. The prices are higher than most, but there are usually fewer people in each group. 3 Calle Poniente 24, Antigua, 03001. 7832–2657.
Sin Fronteras will take you on a one-day trip to Pacayá or a two-day trip to Fuego or Acatenango. 5 Av. Norte 15A, Antigua, 03001. 7832–1017. www.sinfront.com.
Voyageur is a reputable outfitter with excursions to Pacaya. 4 Calle Oriente 14, Antigua, 03001. 7832–4237.
Adrenalina also leads daily guided hikes to all four volcanoes. 5 Av. Norte 31, Antigua, 03001. 7832–1108. www.adrenalinatours.com.