I would like to propose that some unique locations be added to the game in existing cities/towns based on the many billboards found throughout Chernarus. Quite a few of the billboards reference some sort of location specifically, but many of them are to places outside of Chernarus. Fortunately, many of them are also in Chernarus and adding them would be a small way of making a huge impact on the variety of each area without having to go through the trouble of adding a whole new location to the map. Here are a few of my ideas, some of which have been inspired by others (so I can't take all the credit):
Tozer® Tractor Showroom
Based on the Tractor Ad billboard, I think it would be interesting to add a tractor showroom to one of the existing buildings in Elektrozavodsk. The sign itself references an address of "76 Liberty Street" in that city, but we have no way of knowing exactly where in the city that would be. Arma has some existing tractor assets that could be used, but I think a fresh-sheet design would be better to match the lore of more John Deere-esque tractors.
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The Ranger Cinema
Based on the Escape from Kolgujev billboard, there could be a cinema (movie theater) somewhere in Chernarus named Ranger Cinema. Given that Elektrozavodsk and Chernogorsk already get mentioned by name on other billboards, I would recommend that this one be put somewhere else that more desperately needs something unique (not Novodmitrovsk, not Severograd, not Berezino).
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The "Factory Club"
Based on the Megakoncert billboard, a music venue could be situated somewhere in or near the industrial section of Chernogorsk. It could even be based out of an old factory building, as its name suggests.
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A Real Vodka Distillery
Although technically a vodka distillery already exists, it would be nice to see it made into a more functional location with inspiration from both of the existing billboards (this one and this one). The game is already having glass vodka bottles implemented, and the location already exists, so it wouldn't be too much of a stretch to take it one step further and give us a visually-functioning production facility for vodka.
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Pizzeria
This one is almost too easy. I'm sure I speak for most when I say this: please give us a pizzeria based on the real one referenced on the billboard :) Or, if that's too much work, customize one of the roadside stands to make it a pizza place.