1

I hope you are aware that we are in the middle of rainy season and you can expect some delays and problems visiting.

2

The following ignores the weather entirely - you will indeed be going back in the "altiplanic winter" which can be extremely unsettled.

Sajama NP is indeed amazing. It is very accessible from Oruro. There is very decent accommodation in the access village, which is just off the main highway between Oruro and the Chilean border/Arica. From the village there are sublime views (remember what I said about the weather!!!!) of volcanos Sajama, Pomerape and Parincota. Pictures of what awaits you below:

http://www.travelblog.org/South-America/Bolivia/blog-745068.html

There are some amazing hot springs with sweeping views of the volcanos, but you'll need to charter transport to get there, it would be a long walk from Sajama village. Just opposite the village looking towards the border is an amazing valley you can hike up (figure on a while day there and back) to the Chile-Bolivia border and some gorgeous high-altitude lakes. There is a splendid geyser field and hot river (no bathing - it's very tempting but immensely fragile so please don't!) there as well. I would recommend asking around in the village for a guide - the office where you pay the park entrance fee should be able to help (Spanish only of course).

Once again, this is the wet wet wet season. Take care!

Will