I have a question for you: How big is your table?
The board, pieces, cards, character sheets, etc etc etc takes up a lot of space. Adding in just the Innsmouth expansion threatened to spill over the edges of my table, let alone adding more, but I just have a square table. Either playing on a proper dining room table or the floor might give you more space, but possibly less comfort, depending.
Also, perhaps it's just Innsmouth, but as the rules are written there don't seem to be many reasons to actually go to the expansion area unless your character demands it or you get unlucky and the cards dictate that gates open in the Innsmouth area.