Wat Tuek is a small temple ruin in Sukhothai's western zone, with the remains of a viharn and a sturdy mondop. Its name means "Temple of Masonry", a good clue to the simple brick-and-stone character of the site.
It is a supporting stop, not one of the park's great set pieces. Add it if you are already cycling the western ruins and want to see more than the famous temples.