Chuck, here is the best description I could find:

"Return toward the start position in Auldale and proceed east and then north toward the park. Pagans populate the park and unless you've been earning favor with the cornerstones, they won't appreciate your intrusion. Put out torches, sneak in corners, use long-range broadhead arrows, or toss a couple flashbombs to distract the Pagans while you snatch the amulet. It's located on a table to the left of the fountain. Note that this fountain will also replenish your health--though just a single time usage.

Return to the pump station and approach the vines covering the entrance. The amulet makes the vines disappear. Enter the pump station and use the valve to drain the canal."

Do the vines disappear for you? Maybe you still need to use lockpicks.

There is a picture of the table in the guide. It has decorative squares. If this doesn't help, ask at TTLG.com. They can probably answer your question.

http://www.gamespot.com/features/6100413/p-22.html

Hi Pokey..thanks for reply..but..noone answers
my question as to what Amulet looks like and is
it supposed to hang lit up on top of my compass.
When picking up this object..I get that it is
"nothing". Taking back to pump..vines do not
disappear..door just rattles..no way to pick it.
..will try for answers on TTLG.com..thanks,Chuck

Chuck, I have no idea what you picked up but it must not be the amulet. Can you post a screen shot of it?

Hi Pokey..thanks again for your help. This time
I went and faught all Pagans,etc..and the Princess(Dyan)..she dropped amulet..I picked it
up and it went..lit up..above my compass. I
got to Pump..nothing happened..vines did not
go..door only lit up for a click when I dropped
the amulet...could do nothing with it while it
was on compass.(before, when talking with you..I
did not fight anyone,etc..just happened to pick
up amulet)..thought this fighting would solve the
problem..but nothing was different. This item that looked like a cane was carried by the Princess pagan. Hasn't anyone played this game
and can see what I'm doing different than what
they did? TTLG hasn't helped so far..thanks much
for your help...Ceecus(chuck)...

Chuck, that forum has little activity these days. I usually get a quick response on the fan mission forum. Maybe someone will come along, though you may be the only one with a problem like this. The only thing I would suggest is to go back to the table and do a careful pixel hunt of the table and the area around it. Did the item the princess dropped actually have a label "amulet" on it? Was the table the same one pictured in the Gamespot game guide, assuming that the table pictured is the one.

Hi Pokey..all I know is after a lot of fighting the
pagans in Park where amulet is..took two days to
do. Last one was Princess..I killed..she dropped
this item on table..must be amulet..I picked up
and did as I have told. Only one table in the
corner...but this item did not have a label..what
else could it be? Went way back on some game and
saw an amulet...looks like this item...thanks...Chuck...