I've thoroughly enjoyed every meal I've had at Khao San Road. The street style pad thai and the squash fritters are incredible. The pad thai is slightly sweet with a nice kick; you can even choose to have it with tofu, beef, chicken, pork and shrimp. The squash fritters are crispy on the outside soft on the inside deep fried pieces of squash woven together like a funnel cake and served with an awesome lime ginger sauce.
The wait times for this place vary quite a bit; on my first visit, I was seated within 5 minutes (Tuesday at 5pm), whereas I waited 30 minutes on a Wednesday at 6pm. My advise would be if you can go right when they re-open for diner at 5pm it's usually better.