If an active adventure in belize is what youre looking for head underground to the crystal cave located in blue hole national park an expert guide will take you spelunking cave exploring after a hike through the lush tropical forest amid a rugged limestone landscape inside caverns adorned with crystalline formations youll find artifactsincluding pottery beads and obsidian bladesfrom the ancient maya who considered the cave a sacred passageway to the underworld known as xibalba yo