While in Frauenstein to see the ruins of the castle you might want to explore the quaint town itself a bit. The market square is nice - surrounded by townhouses of the 19th century, the ev.-Lutheran church (1871-73) in the centre. A fire in 1869 has not left much of older architecture.
There are still some things to see: The so called "Neues Schloss", built in the 16th century and nowadays used for offices, meetings, apartments. On the ground floor there is a small museum on the most famous citizen of Frauenstein: Gottfried Silbermann, the Baroque organ builder, who was born in nearby Kleinbobritzsch (house where he was born preserved).
See the distance column on market square as well, stroll along the side alleys, watch everyday life and maybe have a coffee and a piece of pastry in a cafe/bakery.