In the US about the only thing I'm aware of is vaccination mandates for certain jobs and activities and indoor masking in certain states. Otherwise you can do pretty much whatever you could before the pandemic. Indoor dining, bars, theaters, gyms, flights, cruises, sporting events, offices for work, whatever.
Unless, of course, the business is short staffed and has to close for a while, which is not a "rule and restriction" but a fact of life right now, which doesn't go away just because you or the government wills it to be so.