Little things, but can really add to the immersion!
Have a setting in menu for “realistic” environment factors
Examples:
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Lights on baseball fields, tracks, etc. turn off after like 10pm. Also not on when temperature is < 40 F (4.5 C)? Except major football stadiums (USA).
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House lights start turning off after 9pm sliding scale factor, later it gets more lights go off.
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System will reduce leisure boats when temp < 45 F (7 C), sliding scale to NO leisure boats when temp < 32 F (0 C).
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Fall/ winter effects such as ice on smaller lakes if temp < 25F. Also condensation exhaust due to temperature, etc.