Bonjour,
on part pour
Yellowstone puis SF dans 2 semaines... On fera le trajet de nuit en Greyhound, donc pas trop d'infos à te donner de ce côté.
Pour
Yellowstone, voici des propositions de ballades qui m'ont été proposées sur un autre forum: Je crois que la deuxième rando (fairy falls) est vraiment à faire: pour voir le grand prismatic avec un peu de hauteur plutôt qu'au ras des pâquerettes sur les caillebotis...
On te commentera ca à notre retour début juin

Voici les propositions de rando:
Specimen Ridge: The hike to Specimen Ridge is about 6.4 miles roundtrip with 350 feet of elevation gain. This is a hot, grueling trail during the summer, but in May it could be a
nice hike. From Specimen Ridge, take a short spur trail to the Specimen Fossil Forest and see the petrified trees.Fairy Falls: This hike has two possible routes. The preferrable route begins at Midway Geyser Basin. From here, it is a 7 mile roundtrip hike. The waterfall is 197 feet, so it is one of the park's tallest. However, one of the main reasons you would want to begin at Midway Geyser Basin is because along the way you will be treated to one of nature's most spectacular displays of color. From the trail, you will see Grand Prismatic Spring's brilliant shades of red, orange, yellow, green, and blue from above. I would definitely do this hike!Brink of the Lower Falls: This is a very short hike of only 3/4 of a mile roundtrip, but it is very steep down to the bottom. At the end of the trail, you are standing at the top of 308-foot Lower Fall of the
Yellowstone River. It is an incredible experience to stand right where the water plummets over the top. On the way back, take a side trip to visit 129-foot Crystal Falls, also a great, but seldomly visited waterfall.