Wild river swimming - excellent fast flowing river in beautiful valley, with deep pools and stony beaches at the side.
www.corsica.co.uk/Docs/About-Corsica/Central-Corsica/Things-To-See-And-Do.aspx
Nearest village is a steep 2 hour walk away - Olmi Cappella, but you can drive down a windy road to the Tartagine valley floor.