Most likely a garter snake, whose only defense if picked up is to pee on you. Smells awful but other than that no permanent harm. Actually the larger ones will also try to bite you but other than a few scratches they really can't chomp off a finger or a thumb.

Some of the larger milk adders can be scary. They look a little like rattle snakes but they are harmless as well.

Your friend was probably more in danger from human predators in Baxter Park. There are cannibals encamped there.

Cheerily,
Charley Noble