Guarnjana's is a family owned restaraunt the locals treasure. You'll notice that most of those who enter are greeted by name and enjoy discussing how school is going with Mark and Marsha, their children who work or do their homework at a side table there.
This is absolutely the best Thai food in the area! Very authentic, with a menu to please every taste. The owner is from southern Thailand, where the fish is fresh and fruit is plentiful. You can taste the unique spice blends of this region in her cooking. I love spicy food, but we take the kids (this is their favorite restaraunt), and they like the peanutty and milder garlic dishes. Our favorites are Tom Yum, Pad gah Prow, Gang Pah, and sticky rice with mangos. From garlic and basil to curries and great fish options, your senses will be delighted! The menu is nicely laid out to describe what comes in each dish, and you can let them know if you like it spicy or mild.
It's not in old town but is near the Massaponax area (four-mile fork, if you ask a local), and it's in the same parking lot as Southern States.
Enjoy...