Into the Westwood
This is an OSR/D20 adventure for low-level characters. Characters who have been through "OSR At the High Point Inn" and "OSR In the Pass" could be used or new characters could be introduced. Combining some of the experienced characters with some new characters would be fine.
The basic adventure¸ going from the Barony to the Isolated Hills¸ should take two or three sessions but there are several available side trips that could tempt the characters into adventures lasting much longer. A GM who wished to could have travelers using this adventure¸ adjusting for what has gone before¸ several times.