Pachnai route is the shortest of all 5 routes. It takes min 2 and half hr to reach top. The route is very scenic along with a man made bridge and naturally occured ponds.
After reaching the top. Visit Lord shiva mandir, lord ganesha mandir, taramati peak. And pushkarni (sacred water tank) kedareshwar shiv linga. Also there are many caves which can be used to stay/camping
Later on move towards konkankada ( the major attraction) enjoy the beautiful sunset. Pitch your tent and have a wonderful night stargazing by sitting near bon fire.