Nobody will ever say to you, “If you go to Vietnam, you have to see Long Xuyen.” Not that you should avoid it- it’s quite an interesting, regional centre, surrounded by some beautiful river and farmland scenery. It’s that farm life and scenery, as well as a lack of tourists, which make Long Xuyen a place to see unfiltered rural life, rather than any “attractions.”
There aren’t any. But don’t let that worry you.