The Hundred Islands National Park was declared a National Park on January 8, 1940. It is comprised of 123 islands during high tide, and 124 islands during low tide. It covers around 1,860 hectares of ancient corals and seabed formations scattered over the Lingayen Gulf. Aside from a popular island-hopping destination, the islands have distinct features, with some islands hosting adventure activities that range from kayaking to ziplining.

The serene falls has a  wide, calm, basin with clear waters that offer a relaxing spot for swimming or picnics.

A hidden gem in Santol, La Union known for pristinely hidden waterfalls that plunge into a 20-meter deep pool. Its name means "house of unseen friends", likely due to its mystical appearance and relatively hidden location.

The SIFCare-CURMA (Coastal Underwater Resource Management Actions) Hatchery is a sea turtle conservation site which gives visitors the chance to take part in educational conservation efforts such as beach patrols, hatchery management, and pawikan release. It is an initative of the Science of Identity Foundation Community Assistance for Responsible Existence (SIFCare), which is the humanitarian arm of the Science of Identity Foundation.

Known as "the surfing capital of the north", San Juan is popular among both beginners and seasoned surfers especially from July to October and November to March when the waves are most ideal for surfing.

Urbiztondo Beach has an array of accredited surf schools and surboard rentals. Aside from surfing, Urbiztondo also has a selection of beachfront resorts, cafes, and bars.

The cleanest inland river in the north, Tapuakan River, also known as Tapuacan or Pugo River, was recognized by the Regional Development Council (RDC) of the Ilocos Region and the La Union provincial government as the cleanest and safest inland body of water in the region. It has shallow pools and smooth rocks that make it a relaxing and scenic destination for swimming and river trekking.

One of La Union's most easily accessible waterfalls, Tuddingan Falls features an interesting layer of rock formations and a 70-foot waterfall. It also has a man-made cement path going up 700 meters for those who wish to see the falls from atop a lush hilltop.

La Union's most iconic watch tower is located on a pebble-lined beach in Brgy. Victoria in Luna. The Spanish-era lookout point was declared a cultural treasure in 2014. When a typhoon hit in 1996, the tower was damaged and split down the middle - hence its unique apperance where half of the original coral and lime structure is complemented by modern materials which were added during restoration efforts in 2017.

Located right along the MacArthur Highway in Bauang, Gapuz Grapes Farm lets visitors pick their own grapes and learn all about how they're cultivated.  it contains rows and rows of scenic grape vines where visitors may walk through and take pictures with. They also sell grape cuttings for propagation as well as fruit wines made from seasonal produce.