water areas ( rivers , lakes , sea ) / boats / zombie fish

- add real rivers or lakes ( instead of the recent shallow water areas that you can walk above !! ) 

- add sea and beaches

- add the ability of swimming to players

- add water zombie creatures such as hordes of piranha like fish, large shark like fish, octopus zombie with tentacles

- add transport system: jetski , boats , yachts , ships

- add harbors and docks

- a base can be in a harbor with a built in workshop for boats upgrading

- boats upgrading in individual aspects : storage , armor , engine (speed) , fuel capacity , color

and every type has a limit in upgrading these aspects (see my post on " new vehicle upgrading system "