Most DLR character photo ops will not have a PP with the exception of PFF, Mickey's house, A&E and Olaf. There can be ones at places like Pooh & Friends or Lightning/Mater but it's not consistent. Just the other day I got in line for Mickey on Main St. Just before I got to the front the PP left. I saw him about 20 minutes later working crowd control for the parade and Mickey had no PP. You tend to only get 2-3 shots at character greets, but there have been times where I've only gotten 1 shot, like at the sign in Carsland and at the old Rapunzel one. A good tip is to go to the photo center before the end of your trip to see if you want to retake any shots that aren't quite what you wanted. If it's something like A&E which you need an FP for and will probably only do once I'd still give your camera as a backup in case someone's eyes are closed or something. As far as best locations, you really have to take the spots where the PPs are located as this time of year they tend to be fixed. What you can do is ask which magic shots are available at each location. So you might get balloons at the castle and train station to see which one turns out best. Or Tink at the partner's statue and castle to have 2 options.