From a previous post, separated out for ease of finding information.
A Saigon Cafe. It's known around here as "The Restaurant Without a Sign" or simply Saigon Cafe. If you like Vietnamese food, or other south Asian fare this is the place for you.
A Saigon Cafe is located Wailuku, and there are stars on the roof. Nope, I'm not kidding, there are electric light stars on the roof. It's a little tricky to get to, but if you take the first right in Wailuku, past the overpass, and then take a right onto Nani St. You'll see the restaurant to the right. Look for the stars on the roof. The parking is somewhat limited, and there is an apartment complex with reserved parking. But, it's never been a real problem to find someplace to park. Besides, if it was really difficult it'd still be worth the trouble.
The waitstaff are friendly and quite funny. I'm careful about what I order. I avoid the "special" dipping sauce that comes with the summer rolls and instead I use hot sauce.
Our favorite items are the Hot and Sour Fish Soup with Mahi-Mahi, and the Shrimp Claypot. I've never had stomach problems after dining there, and I've never felt glutened. If you're very concerned about cross contamination, you might try elsewhere, but you can always talk with your server about the menu items. Presenting a dining card might help make things clear in case of a language barrier.
When I went to the mainland last year, the first place I went after leaving the airport was Saigon Cafe. Hot, flavorful, and comfortable were a great combination for returning home. Not having to cook was also great.
A Saigon Cafe
1792 Main St Wailuku, HI 96793
Mon-Sat 10am-9:30pm; Sun 10am-8:30pm