Rent a motorbike and ride through the national park countryside

Visit the Pub with Cold Beer — a quirky roadside spot with views

Son Doong Cave expedition — a bucket-list item but expensive (~$3,000, limited permits)

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

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