Corresponding with the 1.7.2 update, there have been some updates to the map! (also, the map is much less hard on FPS with 1.7.2). Some overall changes I made were adding in a lot of the new decoration flowers, some tinted glass panes (red glass panes used with redstone torches are pretty spooky!), and some tall grass for exciting chases. Here are some screenshots; download has been updated.
Tall grass (2-block tall) for exciting chases and hiding spots!
Some updated blocks here and there; I think it looks better
Changed the blocks underwater from glowstone to red sand - it looks pretty cool!
Made some variation between pack ice and regular ice here for a visual appeal
The ship needed a lot of work; now it's looking good
Made some changes here with red sand and pack ice
Added in some glowstone and pack ice to change it up here
Pack ice looks much better here.