Sinaia monastery is just down the mountain from Peles Castle. It's the center of Sinaia town, as the town grew up around the monastery. The monastery is no more than an acre large, but it's beautiful. These are photos from this past July when we visited.
While in Krakow we bought some nail polish. The brand is Inglot, and, although it's supposedly an American company, I've only ever seen it in Poland. It covers well, is bright, and resists chips. On top of that, the colors are beautiful.