We are lucky with this campaign, two talented members of our gaming group have been making lots of buildings, a castle each(!) and houses and temples etc for this historical context, so when they bring everything, and other gamers bring more basic terrain tiles and hills too, we have enough to cover a very large gaming surface.
Also the GM of this campaign spends a lot of time to devise the scenarios and intrigues, to write character sheets for everyone, etc. And there are small surprises everywhere. For exemple, in this game, a female player who usually leads a group of ninjas was only moving from place to place a cart of singers and comedians. So everyone suspected these comedians to be ninjas, but in fact they didn't do any harm during the game. However this player was always busy on other tables talking secretly with some players but not moving any other miniatures. I now think that her real ninjas were in other disguise and moved by the GM as if they were NPCs... it worked so well that I never suspected it during the game.