if 3 chests spawn in the same place then that's already a pretty good place to be
from memory, haunted hills has a /lot/ of possible chest spawns. here's the ones i can recall:
one in the church tower
at least one in the church itself, may be two
one in the church basement
one in a building next to the church
one in that building's basement
one in another building on the other side
two in the small building opposite the church (right next to eachother too)
one in that building's basement
one next to a grave right outside that building
one in a car a small distance outside the graveyard
coupled with the rest of the items you can find in haunted hills, and the pair of houses nearby (with one chest spawn each), i'd say haunted hills is a pretty sick place to land
you might have to run from the storm quite a bit though