A few thoughts, while I think of it:
1. If you guys are in a large enough group, you might want to start in different parts of the village. One idea especially, is to start at the end (near the mill and the church) and work your way back into the village. People usually start at the beginning, not the end, so there won't be any people back there if you go early. Also, don't be surprised if a few buildings are closed at the back there -- usually the mill is in winter, but sometimes the others as well if the village is short-staffed since not everyone makes it back there. There's also an alternate path (no buildings) that goes behind the mill back to the start of the village. If you've ever seen Anne of Green Gables, that's where they shot all the winter scenes that took place with sleigh rides. (I've never seen that much snow there though, since the village is closed in Jan/Feb when Toronto is most likely to get that kind of snow).
Another benefit to this is to be able to get a sense of what the light is like is different buildings at different times of day. You could compare notes at the end of the day and then have a better plan should you decide to come back later.
2. One building that always looks great at the end of the day is the old grain barn (near the front of the village, across from the harness maker). If it's sunny you'll get wonderful shafts of light that come through all the old wooden boards and are particularly illuminated by all the dust in the barn. The barn is locked up by the harness maker a little earlier than the village closes, so make sure you go a bit early to have enough time to shoot it (you can't go in usually -- there's often a chain, but you can get good shots just from the entrance). And watch the sun! No sun, no shafts of light.
3. Again, asking the interpreters if you can take their picture is really appreciated. Even though I'm a photographer, I'd get very annoyed when people tried to 'sneak' a shot and would deliberately do something to ruin it. (that's just me though!). Asking people for a photo shows respect, not treating them like a mascot at an amusement park (believe me, this happens. I once had a woman walk up to me and lift up my dress to see what kind of underwear I was wearing! Trust me, other than a few diehards, no one wears period underwear. And even if they did, that's still extremely rude). Anyway, to avoid posing, you could ask them to do something specific (about what they are doing currently, not something you would like to them to do which is out of place) which will probably result in better pictures.
4. Finally, since this is Christmas season there will be a lot of vintage decorations and food to photograph (but don't eat it! Not that Apuggers would, but people have. It's just for show -- full of salt to keep it from spoiling). It's really nice to get all those little details now since the village looks a lot more bland and normal the rest of the year. Actually, in most of the houses people do cook so if they offer you food, don't be afraid to try it. You might ask if any of the baking contains lard though, if it's a concern for you. And just to stick with that subject, all the bread is baked first thing so it's nice to go straight to the Halfway House and watch the cook/baker prepare the bread and get the oven all fired up. It's also the building that's most likely to have several interpreters working in it at the same time. As a side note, if you want any bread, order it early since it usually sells out quickly.
That's all I can think of for now, but if you have any questions, please feel free to ask (BCPV is like a second home to me). Here's a few more photos from the winter of 2005: