There are many hikes to do in Normandy, here are some of the most popular options:

The cliffs of Etretat: The cliffs of Etretat are famous for their towering rock formations and panoramic views of the sea. There are many hiking trails to explore, including the cliff path that allows you to walk along the cliffs and see the famous natural arches.
Ecouves Forest: This forest is a popular hiking destination for nature lovers. There are many trails to explore, with options for all levels of difficulty. There are waterfalls, panoramic views of the hills and views of the valley.
Omaha Beach: Omaha Beach is famous for its role in the Normandy invasion during World War II. There are many hiking trails along the beach that allow you to discover the bunkers and fortifications still present today.

The Boucles de la Seine Normande Regional Nature Park: This nature park includes many tourist sites, such as the gardens of Giverny or the castle of La Roche-Guyon, and many hiking trails, which allow you to discover the natural landscapes and typical villages of this region.
The Mont-Saint-Michel : The Mont-Saint-Michel is one of the most visited sites in Normandy. There are many hiking trails around this incredible historical place, you can discover the beautiful views on the bay and explore the surroundings of the abbey.
It is always important to find out about the conditions of the hike, including times, accessibility, distances and elevation changes, as well as safety precautions. It is also advisable to inform yourself about the rules related to the preservation of the environment and to respect any prohibitions or restrictions.