Salem on Halloween is like Mardi Gras in N'awlins... might be more fun, but the crowds are too much. Also, the town takes on a schizo vibe in that there's the costumed partying going on side-by-side with solemn candlelight vigils to Gallows Hill. Then, of course, there are the holy-roller types telling everyone else that they are going to hell... Odd place indeed on Samhain!
Have fun, and enjoy one of my favorite places. Wish I could be there too!