After hearing screams, Marcus and his team come upon three guard members crucified on a large tree stump in episode 2x02 "Inclement Weather".
The team heads to the Woodlands outside the city to find Killer Frost in episode 2x14 "Escape from Earth-2".
Andrew Eggers follows the creepy figure into the woods and soon after his mother Diana follows looking for him in episode 11x08 "Familiar".
Source: richardwalker00 — Twitter via What's Filming
Ray argues with Nate about history vs. legends when they come upon Guinevere and the knights of the round table in the woods in episode 2x12 "Camelot/3000".
Source: Richard Walker — Twitter
Forest where Helo first meets Sharon after being stranded on Caprica in episode 1x01 "33".
Source: Battlestar Galactica Filming Locations
The team is attacked and Elosha is killed in episode 2x06 "Home: Part 1". The team camps in the woods in episode 2x07 "Home: Part 2".
Source: What's Filming — Twitter