Well, here is my suggestion, seeing as we have skyblock.
Here is a link to the most current minecraftforums post for Oceanblock:  http://www.minecraftforum.net/forums/mapping-and-modding/maps/1553525-1-7-2-surv-oceanblock-survival-5-0
As well as a quote from that post.

Skyblock is a wonderful map, but this is NOT Skyblock, and is nothing like it. Play it for 20 minutes and you'll see.
No lava.
No stone.
Just you, some trees, and a couple friends.

If I missed anything I should have in this post let me know and I'll add it in.