If you want to add a bit of extra culture to your escape, put Monks House of modern art on your to-do list. See if guided tours are available or just wander around at your own pace.
You'll have sightseeing choices galore when in Goslar Old Town. Monk's House of modern art is an ideal place to kick off here, but there are numerous other worthwhile places to discover. Goslar Imperial Palace, Oker Dam, and Goslarer Rathaus are not far from the museum and will round out your day nicely.