Other sights nearby
Here are some more places that are worth a visit when being in this region:
Wetzlar (11 km) and Weilburg (12 km): two other nice medieval cities, at the river Lahn. Also there’s a little but interesting crystal cave in Weilburg.
Solm-Oberbiel: Grube Fortuna (11 km), where you can explore a mine with a guided tour.
Greifenstein (20 km): nice castle ruins with a bell museum.
Freienfels (12 km): little castle ruins, and famous for its huge medieval festival each year around May 1st.

Map of Braunfels
Sign about stinging-nettles
Kurpark
Marktplatz Braunfels