I’ve been thinking about ways to make exploration more rewarding and add a bit of 'pirate flavor' to the coastal areas. Here is a concept for a Treasure Hunting system.
Bottles with treasure maps, or treasure maps.
Where:
Picked up from floating debris with a slim chance (a bottle with a map), or from debris on the coast (just a map).
Alternative use:
Can be learned as a curiosity, but has a level that only affects the quality of the curiosity.
Intended use:
Can be opened and read. It appears as a small, static image of a coastline minimap with a small cross in the center, without specifying its location.
Search mechanics:
The player arrives with a map at a specific location they believe to be "the one" and begins digging in the sand. (Since the map is miniature, the cross in the center can cover an area of 30-40 individual tiles.) If the player has the map in their inventory (perhaps there's a more suitable location in inventory), they have a chance of digging up a chest. (The treasure chest only spawns at a specific coordinate if the player has the corresponding Map item in their inventory. This effectively prevents botting scripts from mass-farming the coastline, as digging without a map yields nothing, and the map itself serves as a unique key for a specific location.")
Treasure generation principle:
The player picks up a chest. It could be a regular chest, or it could be something specifically designed for treasure. Perhaps a regular chest with some shabbiness.
The items generated inside the chest are the same items the player might fish out of the sea or dig up from the ground, possibly with a filter so that only items are dropped, but not branches, dirt, animal carcasses, etc.
Essentially, this is a chance to dig up a set of "random lost items" in one go, all of which can fit into a chest of a certain size.
Additional ideas:
Perhaps players could bury treasure themselves, which would generate a stack of existing "treasure maps." The contents would then be determined by the player burying the chest.
Bonuses:
Gives players the opportunity to create unique interaction methods. Encourages players to explore the world. Doesn't require the addition of radically new mechanics, but builds on existing ones.