Pine creek is an excellent paddle. I've paddled from above Ansonia to black well several times. Camped, and day tripped it. Putting in at Marsh Creek & paddling to black well is about a 7 - 8 hour trip depending on water levels. I've determined the bare minimum to run this is 1.8' on the cedar run gauge. Below that you're dragging your boat in many locations. Last time I paddled pine I paddled my grumman solo @ 1.85. Aluminum boats are sticky when you smack a submerged rock, unlike a Royalex or PE boat. I was able to get down clean with out any issues. If you can read the water, you'll have no problem padding at 1.8'.
The max I paddled was ~5-6'. It was a ride & I paddled solo with my gear for an over night trip in my Mad River ME (White water boat). I'd caution anyone paddling it at this level, if you go for a swim, it will be a long cold swim & could have negative results.
I'd agree with doog - 3' is a nice level.
You need a permit to camp in the canyon (Free). Below Tiadaghton there are many primitive camping spots. It only takes a few hour to get to Tiadaghton, it seems to always be a party spot & I prefer to get through that area as quick as possible to get away from the boom boxes & beer...speaking of beer, I don't think I've ever paddled pine and not found a few cold ones in the water thanks to some poorly packed rafting patrons
Pine Creek outfitters will run your shuttle for about 20 bucks or something reasonable. You can also launch at their business.
Below Rattle snake rock is where I typically take out. This is a PA Fish & boat take out (as is marsh creek put in?), so you'll need a launch permit or take the risk of meeting the fishy police & ending up with a fine for not having one.
Enjoy your trip, it's well worth it.