Nha Trang is known for its diving sites, but due to abundant fishing, live aquatic life is more limited than in smaller coastal cities and islands. There are many providers who can bring you out to the more rural areas, which are full of activities like hiking, watersports and other fun pastimes. You can ask your hotel to give you a list of tour operators, buses, vans or reliable taxis that take you outside the urban area.
Being a coastal city, parasailing, jetskiing and areas for swimming around are all readily available. Swimming, however, should be under the presence of a lifeguard due to the strong currents at certain times of the year.