Debbie...
Thanks for the compliment,,, Yosemite is a fabulusly beautiful location with wonderful vistas at every turn.
Regarding infrared; there are two ways in which you can accomplish infrared imagery:
1. Using an infrared transmitting filter. This works; but there can be some problems due to the excessively long exposures needed when this type of filter is mounted on your lens. It is, however, a reasonably inexpensive way to get into IR photography. The long exposures necessitate a tripod and moving subjects (even foliage moving in the breeze) will appear fuzzy. Here is the selection of IR filters on eBay:
http://photography.shop.ebay.com/Fil...=p3286.c0.m282
2. Converting a DSLR or P&S camera to full time infrared photography. This is more expensive (a lot more) than using a filter but results in a camera which can capture images at hand-held capable shutter speeds. I had a very old Canon D60 (not the new 60D) converted to full-time IR. I don't remember how much this cost but, it was several hundred US dollars. If I were to do this over, I would have converted a nice P&S camera instead of the full size DSLR. That way I would have been able to carry my Infrared capability in the top pocket of my photo vest. Note: when converted to full-time IR, the camera will no longer shoot normal color imagery.
One final thing... Using Photoshop, I don't know of other post processing software, you can do a pseudo-infrared looking image. Not quite as dramatic as real IR but, it looks nice.