Furtive MonstersWhen the party has an encounter, don't have the monsters run right away to attack them. Instead, have them hide. Maybe then they can follow the party furtively. Maybe they'll shoot a poison arrow or try to drag-off a party member who wanders too far from the rest of the group. Maybe instead they'll try to scare the party away or lead them into a trap.
For instance, Goblins in this approach would be closer to Goblins in folklore and pulp fantasy than to Tolkien's warlike Goblins.