Practice common courtesy
This one should be self-explanatory, but I live in New England, which can be known for standoffish attitudes. Look, there's nothing creepier than walking down the hall at work and greeting a coworker with a friendly "Hello" only to receive a stony stare in response (or no acknowledgment at all). I'm not saying you should throw confetti and hand out balloons, but a simple exchange of smiles and a "Hi" is the first step in forming a constructive workplace. Make eye contact and refer to people by name. This is the oil that keeps the engine of cooperation running smoothly. It doesn't mean you have to chat over coffee for an hour and it certainly doesn't mean you have to kiss anyone.