Waterfalls, water mobs that attack you, and detailed water. Anything dealing with water and water biome I'll find Red needing to hit the local pub every night. If he wants to to all out, if it's even his desire, then he's going to be chugging down liquor on a nightly or weekendly basis...If he isn't already. Like a sailor! 
Hmm....I know we discussed this before but I can't help imagine building ships on a shoreline. Not built in a box, or in a crafting grid either....Just imagining a ship sailing after you've built it by hand, out in the open. You're given these ship hulls that you build up through skeletons, add the hull, the features and etc. You build it up while seeing your progress of it. When you're done you'll nudge the boat into the water by hitting it with a bottle of ceremonial liquor bottle that could activate the code itself. You'll then happily sail the high-seas.
What I'm expecting to build:
- Canoes - For your River & lake explorations. 1-5 people can get into one while also having a storage container on them somewhere.
- Fishing Boats - For your fishing needs (to catch all sorts of sea-life). To catch all sorts of sea-life, even those small whales. (Must contain a large storage container)
- Sail Boat - Similar to those found in Grand Theft Auto 5, or any. Something more 'casual' and 'luxurious' for the modern era. These ones can contain a mix of native tribe boats, 'European' sail boats, and even the modern ones found in GTA 5. Whatever red goes for, I do hope it's a fun one to take advantage of the high-seas.
- Cargo Boat - A vessel that'll be a merchant ship for mutliplayer maps. If building a railway is tough, and if players want the easy merchant/cargo ships then they should be able to. Not expecting anything massive....If it fits in the Danube then it should work in this game. Basically a Cargo Barge, a River Speeder, or something along those lines. These boats should be able to carry up to 20-50 storage chests worth of cargo, even liquids. This idea would be supported if Red considered pairing up these boats with 30,000 meters worth of oceans (1 hour journey). They should have the option to store anything that we shall be able to use.
- Coal/Steam Boats (Bonus) - Having the 'iron-clad' type boats to steam around the map, spewing smoke everywhere you go. Hauling goods while staying safe from the elements. Sailing around in a fully iron boat with a wooden deck while being armed by old-school canons. This one is up for some 'fantasy' designs by merging a warship concept into merchant design, or just going designing a ship with a single smoke-stack. This ship MUST contain both cargo and fuel storage. Even a lovely coal engine. This is optional for how silly things can easily become having to be both below and above deck.
I'm imagining the biggest boat in Rising World being what is found in Europe's Danube River
http://4.bp.blogspot.com/_L2jM…eX0k/s1600/LORETTA_03.JPG
- Basically this being able to carry food, ores, liquids, and etc. If we can section off what cargo goes where then that would be helpful also.
- Bonus: Boat Customization:
For customization I want to nudge Red (doesn't have to) into allowing us to build it up through a skeleton form. Building the keel, the skeleton, the hull, the bridge, and etc in parts. Basically having a ghost form that you have to find a flat section of land next to water (think dry docks) to then build it piece-by-piece. Building it inside a crafting table just cheapens the whole thing. This should be something 'big' players should enjoy themselves building. Building the stuff, even inserting what kind of cargo hold, or how to personalize it should reward the player nicely in the long run. Being able to colour the boats, name them, and etc should help personalize the boats. Adding a poster system on the mast would be interesting. The ship's own flag and emblem.
For passenger boats the players should instead be able to build it up straight up, then they can insert what items they want in a limited space. Being able to add flowers & pots, food, drinks, decorations, and etc. A luxury linear, in a way. Programming would be hell, and I'm not going to expect it right away. I just hope this is at least considered because sea-life is also a big thing in our world that may reward the players nicely for their survival needs. I would also leave any 'gigantic' boats to modding. I'm expecting the 'largest' being Danube sized 'giant' boats. The rest for modding.
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[Do note that I'm also trying to imagine what the future shall hold through modding also. Not just vanilla, but modding also. Just trying to expand thoughts also of the possibilities. I want this game to be awesome.]