Order off the pictures on the walls rather than the printed menu. If you don't know what something is, just point or ask. Be sure to get one of their "crispy pork" dishes, such as the pad ga pow moo krob pictured here. They expertly fry the fatty cuts of pork, leaving it crispy and savory, then stud it with chillis and basil. The Thai barbecued chicken with sticky rice is also to die for. Order it with a side of som tam (papaya salad).
Final note: S&I is very easy on the wallet. Entrees are $8 or $9, so go ahead, finish off the meal with a mango over sticky rice.