Dark Cave — zipline, swim, kayak, and mud bath inside a cave

Paradise Cave — a massive illuminated cave, one of the longest dry caves in Asia (~$10 entry)

Join a multi-day expedition to Tu Lan cave system (from ~$250 for 2 days)

Rent a motorbike and ride through the national park countryside

Phong Nha Cave — boat trip into an impressive river cave (~$6 entry)