Known for its incomparably tasty Bangus, the Municipality of Aringay is located north of Agoo and south of Caba along the national highway. Approximately 244 kilometers from Manila, it requires about five hours of driving to reach this thriving municipality. It also has tricycles stationed in front of the Public Market which are ready any time of the day to serve visitors especially for those going to the coastal barangays where most of the resorts are located.

For history buffs, the 500 meter tunnel La Union Centennial Tunnel also known as Sallapak Tunnel awaits visitors. Intended for trains of the Philippine National Railways (PNR) bound for Baguio City, it was later abandoned by the Commonwealth Govenment because of the then impending Second World War. According to locals, the tunnel already exists during the Spanish era, it was only in the American occupation that it was developed and fortified, thus making it officially more than a century year old. During the Japanese occupation, the tunnel was used as headquarters of the Japanese Imperial Army because of its durability against US bombings, rising speculations that hidden treasures were buried in the area.