Many great activities in Corsica are just free of charge. Like hiking in the mountains, swimming in the ocean or lying at the beach reading a good book. Especially hiking is an excellent way to indulge the pristine natural beauty of Corsica, and there are many marked trails for different levels. For the hardcore hikers, there is the famous 180 km long GR20 trail with 12,000m of elevation gain that crosses the whole island. There even are some decent (wind)surf spots in Corsica, for example, in Capo di Feno and Serra-di-Ferro. For around €20 per hour, you can rent a surfboard or a SUP. Another activity for the adventurous is canyoning in the mountains. There are lots of tour operators, and their tours usually start at €45 per person.