The best time to go to El Castillo is during the dry season, which runs from December to May, offering the most comfortable conditions for exploring.During these months, you'll experience less rainfall, making river travel and jungle excursions much more enjoyable. The San Juan River, which is central to any visit, will be easier to navigate, and the humidity is lower, providing a more pleasant experience for outdoor activities.This period is particularly good for those keen on wildlife spotting, as animals are often more active and visible near water sources during the drier months. Birdwatchers, in particular, will find this a fantastic time to visit, with many species active and easier to observe.For travellers who prefer a more relaxed pace and don't mind occasional rain showers, the shoulder months of November and June can also be lovely, often with fewer visitors and lush green landscapes.