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Aventuras Panama. Aventuras Panama runs white-water rafting trips on the Chagres River (Class II–III), which flows through the rain forests. The full-day trip requires no previous rafting experience, is available from May to late March, and costs $175 per person. A shorter, more challenging trip on the Mamoní River (Class III–IV), which flows through an agricultural area, is available from June to January, and costs $125. They also offer kayaking tours on Lago Gatún, the Chagres River, and alone the Caribbean coast near Portobelo. Edif. Celma Of 3, Calle El Parcial, 1½ blocks west of Transístmica, Panama City. 507/260–0044 or 507/6679–4404. www.aventuraspanama.com.