Map encounters are playable

When you explore a new location, it generates a map based on the resource or instance found at that location.
Oil rig would be a small mostly barren island surrounded by oil rigs. Could build a small dock and tiny settlement meant to support the rigs and also act as a host for the cargo ships.
Container ship encounter would be rocky ocean area you have to carefully but quickly navigate to rescue the cargo ships. If your fast enough, you can save two but will always lose the third.
This would also act as a booster for co-op play. The host could stay focused on the main island, while the co-op player(s) worry about engaging the encounters and setting up the islands for further resource refinement.