actually some ideas
-a storyboard might be nice (but its not timed or anything its kinda like a side quest maybe not like a must do to continue thing like if you want you can do this and learn about what happened that cause you to live on a raft and all that)
-like sometimes when you find islands some people will join you if you find something or help them like cure htem feed them give them water and all that
-some islands can be habited by either hostile or neutral or friendly or depending on your behavior natives and some islands ccould be inhabited and some could just host one person like the player stranded in an island
-other people on rafts just like the player stranded like a neighbor that may join you like join ships together
-you can attend those people with jobs but you should give them the appropiete tools like for example for the defending the shark task you should igive them a spear and for other jobs and all that
-there could be a civilization system like if you decide to live on an island with friendly natives if you be very nice to them they will choose you as their chief but that is a rather very far away thought to think
-metal upgradation
-other metals
-melting smelting blacksmithing and armormaking
-marriage like if you marry a chief's daughter or son then you will be the tribe's next queen/king
-taming animals
-range tools
-a blueprint collecting system like if you find a blueprint or a part of the blueprint of a musket on an island or underwater(add a diving option) then if you collect it or all the parts you will be able to craft that
-but basic items will be still already in your mind so you dont need to collect blueprnts of water purifiers or cooking stations and etc
-a sailing system either by sails or if you find the blueprintS of a motor
-other vehicles that could be used in islands
-cities like harbors and all that
-mythical creatures (you decide I want you to vote if you want or not )
-hostile sailors
-friendly sailors
-neutral sailors
-fishing nets
-crabs and crab nets
-fertilizer
-fish growing place and crab growing place
-safety boats
-oxygen tubes
-googles for underwater vision
-to island boats these are used to go to an island they are small like safety boats you row them to the land
-fire mechanisms like you can scare some wild animals or use to hunt some wild animals
-and weather of course
-roofs
-docking to another ship
-docks like you can either build a dock on an island or you can dock to an already built dock
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(BTW if you see this line that means I am just noting and the ideas are above that line and below it is jsut notes)
well if I have have anymore ideas I will let you know if you want or you could tell me a topic and I will produce ideas about it
Hope you didnt get bored from my long list
Regards,
Yusuf Eren Eroğlu