Tra Vinh is a city in Southern Vietnam.
There are direct (mini)buses from HCMC. Another option is to arrive by boat. Eather private chartered or you can try to get on a cargo boat from for example Ben Tre.
For better and more comfortable for your trips, private car is another choice...Car Rental
The center itself is small enough to cover on foot, to explore the greater area you can rent a bike from the tourist office or via some hotels. Tourist office also sells a map (20.000VND, January 2012) which covers both the city and the province of Tra Vinh.
There is a nice and big market right in the center. The city also has some Khmer pagodas.
Explore the center on foot, or rent a bike to see the province of Tra Vinh. The beach side supposed to be one of the nicest in the Mekong Delta.
A place to rent motorbikes is located on Nguyen Thi Minh Khai 42B (about 5-10 minute walk from the center). The shop is called Nguyet. Price for a decent automatic is 200.000VND, manual is 100.000-150.000VND. (January 2012)
There are some affordable hotels in the center.