On the way to Hue there is the famous Hai Van Pass, which has truly incredible views down the coast and through the mountains. Driving through it and stopping at the top was brilliant.
Hue Happy Homestay: well situated near the tourist area.
There is an abandoned water park near Hue that you can enter for a few thousand VND and explore at your leisure, and also a few different temples around the city.
The best Banh Mi I had here was on the street opposite a Mr Bean Bar, which was quite a funny little place.