The bc_smash_pit_island.zip file you have requested: Maps Levels Missions / Misc / [BC]'s Smash Pit Island - 452.22kb is not available. Perhaps try browsing all files for the game Kingpin: Life of Crime and upload any files you want to share or are missing. This is the only information we could locate:
This is a closed-in/walled map, featuring arched walkways, and a single 2-story building; presumably sitting on a tiny ass island. You would have to grapple to the ceiling and look over the walls to see, but it is all water down there baby.