Wow, you've progressed rapidly... You can still gain exp from the gnoll
Watchers, scouts and regular gnolls through level 7, but yes you must either
go inside Blackburrow or head into the Plains of Karana, which actually is
quite challenging. Neither area can be played well alone, at least not
without a lot of dying. I only got my Ranger to just under 8 in beta so I
can't say for sure, but I too had to kill quite a few bears and lions in
Karana and it didn't seem to effect anything. I've heard that while there
are things that effect your standing negatively, there are also things that
effect it positively (like killing Gnolls, perhaps?).
A nice hint book with this info would be nice...not like the piece of
CRAP player guide that I mistakely paid $16 for. Geez what a rip
off....nothing more than what should've been in the regular manual.
One thing to consider is that Druids are the real touchy-feely animal
lovers here...a Ranger can still be attacked by animals unprovoked (happened
to me first time I went to Karana) which leads me to believe that there may
be a little lea-way when it comes to guild standings for the Ranger. I
might be full of it there...but maybe not.