How exciting, @GeminiGoddess523!!! 
I love Salem so much I actually wrote up a post about it a while back, it has a few recommendations and tidbits you may find interesting: Salem: A Town of Witches 
Naturally, there are plenty of witchy sites and shops to explore- and in addition to the magickal spots around town, you will also find plenty of other interesting things too! There’s a great museum, a lively Asian community, the historic House of Seven Gables, beaches, great seafood, and so much more 
(Can you tell how much I adore Salem? 
)
Parking can be a nightmare if you drive there, but there are several parking garages (we always use the one near the museum- if you buy something in some of the shops in the Witch City Mall, you can get your ticket validated 
). There is always excitement in Salem, but you should be able to get around without too much trouble as long as you aren’t going in October.
I hope you and your girlfriend have a blast! 
Have a wonderful time in Salem! 