If you have some time left, I recommend renting a bicycle and going for a ride around the streets of Nha Trang. The terrain is plain, and the town is not very big. If you want, you can also rent a cyclo to visit the town. Cyclos are bicycle taxis. You sit on a comfortable chair, the driver sits behind you and pedals. Some of the passenger chairs are wide enough to sit two people. Most cyclo drivers know some words in English, but they are not fluent.
Another option is renting a motorbike. You will be offered motorbikes for rent in the streets. If you want to be safe, ask your hotel. If you rent a bike, a motorbike or a cyclo, negotiate first. Although Vietnam is officially a communist country, Vietnamese are business people. If you are good at bargaining, you can get pretty good deals.
♥ Visit Tagulandang Island ♥