How Should I Prepare For My Sandbox Campaign?

Next month, we are restarting my Adventures in Shadow campaign, set in Gloamhold. (Hooray!) The campaign is going be much more of a sandbox campaign than we’ve recently run, and this presents a minor problem for me as I love to be super prepared for the game. So I thought I’d ask you, how do you prepare for a sandbox game?

Help me prepare my game, by leaving your advice in comments in the below.

 

Languard Locations: The Orc’s Head

Cut from a chunk of local limestone and set above the tavern’s front door, the luridly carved face of an orc identifies this place as the infamous Orc’s Head. Notorious throughout the duchy as the haunt for adventurers preparing to dare Gloamhold’s depths, the Orc’s Head is a place of tall tales and hard drinking. Decent folk rarely venture inside.