(Red Marker on map is where to go)
The cross, coffin and the church blueprint aswell as the Crossbow along with some crossbow bolts scattered in the vicinity are located at the shipwreck which is to the yachts bottom left. You will have to travel down a fair bit to reach this blueprint.

You will find the glider and the tower to the very west of the map. When you enter the cave keep exploring it and before you reach the rope to climb down to go to the glider, there should be the tower blueprint laying on the floor next to it, you can't miss it.


You will need to go down the rope and keep following the path until you find a room with a ♥♥♥♥ ton of pages stuck to the walls and on the back wall there is the glider along with some crossbow bolts.







(this is what the room looks like)

The coaster is located in the southeast. You just have to follow the path and will eventually find the log track alongside the Old Suit, which looks similar to the blacksuit you find in the sinkhole.




This is what the suitcase looks like to find the old suit.

Also you will find a half built coaster and there is a bug where you get 13 leaves per hit on the coaster.