Best secret/hidden quests?

[Sledge Hammer!]

I've finished the main story and I'm now wandering the Commonwealth looking for unmarked quests. Can anyone suggest locations for secret quests that don't show up on the map?

[wootarma]

The Aliens near vault 75

Submarine

Christmas in Diamond City

There's a bunch of movie/games references hidden around.

I think only the first two are actually quests.

[Mansen]

http://imgur.com/gallery/uWOHK

Here's a bunch of places to visit with as few spoilers as can. Just the locations - you'll have to explore them

[The_Pastmaster]

The Cabot House one was pretty good. :)

[Bible Juice]

There are letters that give you quests

[Kevin the Inkling]

Not really a quest. But not particularly obvious. The Largest Settlement in the game is also the only Island Settlement. It's kinda easily missed since while no missions ever send you to that location. You just have to swim there on your own. It's called Spectacle island. It's got a few buildings a ruin.

What's nice about Spectacle island. In the effort of setting it up you will need to fight a Mirelurk Queen by turning on the generator of a boat. And following the directions. Yeah it starts with a freebie 10 power generator. You can't remove it or anything. There's also a ton and I mean a ton of open flat land perfect for setting up a large farm. Plenty of space I mean plenty of space to work with. A cool little dock with a boat house. I reffer to it as the city settlement. In my game I actually have 60 settlers living there. Well fed, deffense good, water situation a non issue since I got plenty of ocean front to use water purrifiers with.

[joxertm22]

Yarri původně napsal:

Not really a quest. But not particularly obvious. The Largest Settlement in the game is also the only Island Settlement. It's kinda easily missed since while no missions ever send you to that location.

This is absolutely not true.
If you're "sucking up" to Railroad instead of rushing the main story, Railroad assaultron can give you a quest to clear that island from mobs and use it as a place for next RR "safehouse".

Any logic? Of course! Because when you're about to build teleporter and choose help from Railroad... Yea, huge space needed, island provides it - the game will tell you to build it on that island! Of course you don't have to. I built it in Sanctuary.

According to fallout4 wiki the settlement you get in this quest is random. I guess I got lucky then.

EDIT:
Anyway, here's the pic proof (or it didn't happen):

http://steamcommunity.com/sharedfiles/filedetails/?id=572403875