Mysterious Package

We are playing a bunch of middle-aged nerds who are RPing in
Christchurch, New Zealand: Wizz Crelan DM, Sean a life-coach (Shane), Nathan a civil
engineer (Jeff), Martin a middle manager for MSD (Darryl), Howie an
accountant (Ian), Carmilla a CYPS Sociologist who works with special-needs children (me).

While we are playing Wizz Crelan's game (a collection of random
encounters in a big forest ), a  delivery arrives which is a package Wizz ordered off EBay.
It is a boxed 1st edition set of D&D, but stuffed in the back are some papers.
They are transcripts of a diary written by Garry Gygax back in the 70s
where he describes some strange goings-on and some apparent portals,
and gives three latitude-longitude coordinates. Two are overseas
(Island in Pacific & a town near Seattle) but the third coordinate
points to Jackson Bay (south of Haast). So we hop in our cars and go
for a trip to there the next weekend, under the guise of LARPing.

The bay is privately owned, and the road is blocked by a metal gate
and a guard; with a gun. Nonplussed, we hire a boat and go for a jaunt
around the headland and head up a track towards the coordinates (the
coords are only accurate to 1/100th of a degree, so that equates to a
1km circle). As we walk, the nerdiest of us (Wizz, me and Sean) start
to get an excited thrill in out bodies, and it increases as we
continue. The other three (Nathan, Martin and Howie), who are not as
nerdy, feel nothing.

A strange figure, holding a medieval battle-axe stands on the track.
As we approach it turns and shambles towards us. But it is obviously
not of this world: deathly grey, reeking of decay, and with eyes
glowing with feral light. I had a rifle (.17) and Martin had a
shotgun, so we shoot it and kill it, but two more arrive so we have to
fight them too. We manage to drop them, but during the fight, Martin
almost gets his arm chopped off and Howie gets a brutal whack to the
head.

We inspect the things and they are obviously long-dead. But they are
dressed in recently bought clothes from Farmers and the Warehouse,
some still with the price tags on. The weapons (long sword & two axes)
are well-made, by hand, in authentic medieval re-enactment style.

"Zombies!" proclaims Wizz. Our nerd-thrill surges.

Martin and Howie are feeling bad, so Nathan helps them back to the boat,
while Wizz, me and Sean head a bit deeper using the intensity of the
nerd-thrill feeling to find the source (amid cries of "don't split the
party!", but the nerd-thrill is so exciting!).

We spot a building,
about on the centre of the coords, we guess, and there is another
zombie and a real guy with a real shotgun, so we bid a hasty retreat.

We sail back to the boat hire, and take the two injured ones down to
the medical centre in FranzJoseph. The local cop turns up, but he
believes our story about LARPing injuries. Besides, I am still dressed
as priestess of Luck.