How close is too close for the Old Hunting Lodge?

Levi has years of experience with sneaking/scouting so he would try to glean as much information as he can about the encampment without actually going within dangerous range, if that's possible at all.

Things like how many people seem to be entering/leaving, entrances and exits, any fortifications or watch towers, any ritual blood sacrifices being performed in the yard, etc. Is there anything he might pick up on?