Been awile since I actually played H&H I can't imagine what I've missed:D had some ideas I wrote down aegis ago kind of wish I could compile them all into a single thread but from what I recall they must be streamlined.
So without further ado what i would like to suggest is a few new biomes and factors corresponding with each first off
Desert (sandy) - Consisting of sand dunes salt marshes and very few landmarks the desert is a place where few venture and even fewer survive.
Their Is lots that can be done with this biome from things like heat exposure effecting your thirst sand slowing move speed to mirages maybe things appear on your minimap or edge of screen but as you approach they vanish into air.
Resources in the desert can be scarce surface water only forms at the basin of mountains and natural aquifers are far less common, trees are virtually non-existent seek refuge in caves if available.
As of means of consumption to obtain energy your going to have to work a little harder to find a meal out here tortoise though rare can make a mean soup also be on the look out for armadillos, coyote, scorpions, snakes and wasps.
Flora is a good indicator that a possible watersource is near by
When encountering a sandstorm it is best to bunk down if the surrounding area is unknown