Relic said:
"What the most positive and/or negitive G's a person can experiance with out dying?"
This is a bit of a how high is up question, though you probably didn't realize it. How many G's you can take depands on how long, in what direction, and how applied. Slip on ice and fall on your backside, and you may experience 30 G's for a tiny fraction of a second with no more than minor bruising if you are young or possibly with life threatening injuries if you are elderly.
From a stand point of roller coaster safety up to 4 G's down is usually considered to be no problem though the designer might want to stay a bit lower for helixes where the G load may be held for a longer period. 5 G's can be used for short periods with cautious design. There have been problems with simple lap bars when riders get bent over the lap bar at 5 G's or so. OTSRs (boo, hiss) can help here as can some of the newer lap bar designs that are higher than a simple bar.
Lateral and negative G's on coasters are usually limited to 1 or 1.5 G's, though aerobatic pilots often experience much higher positive G's though with the possible side effect of eyes that lood like cherries.