Thonon-les-Bains has 1 trail including difficult difficulty trails. The trail with the highest elevation climb is GR 5 and the one with the least climb is GR 5. The longest trail is the GR 5 at 624 km. To complete this hike you should budget at least 40 days. For a shorter adventure you can try the GR 5 at 624 km. This could be done in as little as 40 days. Trails with the best offering of hostels include GR 5.