Ok i have managed to successfully get completely current on my massive stack of manga now I am on the hunt for any manga that have any shore/sea or small island settings if it is any help i'm trying to find ones that are likeAmanchu!
Thanks Mates!

well 6000 is under the sea

well I do like horror so I will check it out

IO

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What I like in Trivial Pursuit style. Pick your category:

Hoozuki no Shima - Small island setting. Horror.
Crimsons: Akai Koukaishatachi - This one is a little different from the norm. It's about a group/school of salmons journey to the ocean and back to their home in the end.
Kokushi no Shima - Horror/mystery, island setting. Only one chapter out so far. Could be interesting.

i was going to recommend that!!
i second it

La Mosca
Eden no Ori
Umi no Misaki

Aria - kinda (Venice like setting), recommended
Shinryaku! Ika Musume
Let's Lagoon
Nagasarete Airantou

Underwater/Sea in general:
Children of the sea-the first one that springs to mind
Ever 17 is like 6000, but more shounen and not as good....
Cradle of monsters is on a cruise liner...but if you like Hoozuki island its worth mentioning cause its the sequel...ish
Daphne in the brilliant blue-Underwater cities
Seto no hanayome-mermaids...
Shinryaku! Ika musume-seconded

On an island:
Jisatsutou
Btooom
Black joke
Cage of eden (edit:seconded)
Kaguya hime

Set on the coast:
Happy hustle high-Surfs as a hobby
Air-I think...haven't read it in ages....
7 seeds-Not completely coastal but included it because there are a lot of arcs with sea/coast settings.
Dangerous share

Historical shoujos that have the heroine living by the coast, at least for the first part sometimes longer:
Legend of nereid
Crystal dragon
Rure
The pearl grudge
Spirit of the ocean

wow...thank you all so much for your recommendations these will keep me busy for a while thanks ^^

Angel no Oka - classic shoujo by Tezuka-sensei, mermaids, lot of travel back and forth to an island
Honey na Koto - surfing
Love Cruise - josei, the first story is about a, well, cruise

Assuming you don't want yaoi, have a couple lost at sea, stranded on an island stories if you do.

sure, shoot them my way, not really in to yaoi but I'm not a person to turn down a good story just cause of the sexual orientation of charecters, I like to keep an open mind

OK, here's some more.
Home - they are on a ship just part of the time, but they live in a harbor town, and one of the characters is a sailor.
Tropical ni Koiiro - oneshot, smut

These are the yaoi ones:
Anata no Tame nara doko Made mo - a detective and the criminal he is trying to catch are most of the time at the sea, or stranded on an island
Mujintou Lovers - lost at sea, stranded on an island
Renai Zemi, story 4
Ubawareru Koto Marugoto Zenbu - the extra story is about a boy whose father, a fisherman, died at sea
Ikoku Irokoi Romantan - starts on a cruise ship
Hohoemi no Nichijou, story 6 - it's a tearjerker, though
A Toy With Sadness, story 5, about a surfer (the main story is not a pleasant read)
Ousama Game, story 6, pirates, continued in Kaizoku Game

Hope these help a bit.

I suggest reading the Ever17 visual novel instead of the manga.

some more:
Arpeggio of Blue Steel
Ryuuguuden - This was pretty trippy though. Reader beware I guess.
Hekikai no AiON - seaside town (mermaids)

Umi Monogatari (watch the anime, I guess - although the Japanese in it is very simple if that's your thing)