Beach day — rent a lounger or just use your towel on the public beach

Explore Nha Trang Night Market for seafood and souvenirs

VinWonders amusement park on Hon Tre Island (cable car ride included, ~$20)

Visit Po Nagar Cham Towers — 8th-century Hindu temple complex

Island hopping booze cruise — the classic backpacker experience (~$10–15)