Paradise Cave — a massive illuminated cave, one of the longest dry caves in Asia

Take the Hai Van Pass motorbike loop (Botanic Garden route)

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)

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