Weather is the biggest issue up here. Warm clothing is a good idea for a day trip. A good sleeping bag and sturdy tent is a must if camping. In the wet season snow can make the road dangerous.
fees/permits
Bring copies of passport or remember your document's number, as there is a police check where you turn right to Chacaltaya and the road continues to Refugio Huayna Potosi and Zongo. Police ask for Bs. 2. Admission collected at Chacaltaya is Bs. 10.