When I was in high school sudoku was all the craze. I remember coming in every morning with the newspaper to work on the provided Sudoku before, after, and sometimes during class. I haven't worked on them as much in the past few years, but figured I'd include one to provide the puzzle aspect for this cache.
The coordinates you're looking for are N 41 4A.BCD W 071 3E.FGH. The cache itself shouldn't be too difficult to find. There is no need to cross over the rocks. Good luck, and as always, happy caching!
You can check your answers for this puzzle on GeoChecker.com.