Maps of Misterra

In Maps of Misterra, you play as explorers have discovered a mystical and unknown island. Your goal: Explore the island and complete your personal and hidden objectives while proposing a correct cartography of the island to earn maximum points.
 
To set up, place a central board representing the island on the table, and give each player a personal map they will use to transcribe their discoveries. Each turn, players choose two actions among these:
Move their explorer pawn on the central board.
Discover new terrains close to your explorer pawn, choosing from four randomly drawn tiles.
Claim control of areas.
 
A type of terrain on the central island must be explored twice before being validated. Thus, the unvalidated terrain types can change — "You thought you saw grass? You were mistaken." — and then your personal map will no longer match the central board.
You have to find the ideal balance between your personal objectives, and a correct cartography of the island.