I did a very similar vacation in 2003, you can see all my pictures here if you are so inclined:
http://telusplanet.net/public/markus...3/FrameSet.htm
The best advice I can give you is; do not skip PEI. We only spent 4 days on the island I easily could have spent twice that.
Cavendish is great, the beaches are awesome and I even found the Anne of GG to be fairly paletable.
Charlettown has some great places to eat and museums, not to mention Province House, where Canada was born, it's pretty sweet.
In Halifax I got hella sick eating some bad clams at some place on the harbour (sorry I forget the name). The pubs there were great, my favourite was the Golden (or Olden) Triangle, they had some great live music and the guys would play Stompin' Tom if you yell loud enough.
We also went to NB for a couple of days, the thing I liked best about it was the Hopewell Rocks. That's some amazing tide baby, we also took a sea kayak trip from a little town just north of Hopewell, hard work but worth the effort.
We had a car for most of the time, picked it up right in DT Halifax just down the street from the Citadel (Avis). I think it cost us less than $300/wk.
... what else do you want to know? As a fellow albertan who toured the area just recently I'm more than happy to dispense all the info you might want (or more
)