To wit: My current mother in the law was a simple accountant in a mid-sized Baltic city. She was able to go to a sanatorium in Crimea (without husband of course) for the yearly vacation due to a slipped disk in her back. Where she apparently had a platonic affair with another vacationer who kept writing her letters afterwards..
Similarly I was able to attend Artek (https://en.wikipedia.org/wiki/Artek_(camp) ) in Crimea solely due to my grades. Our village grade school in Latvia had one ticket allocated.
Now this was in February which is not in season. Our komsomol - https://en.wikipedia.org/wiki/Komsomol guide mentioned that only extremely privileged kids with parents high in the party got to go in the summer to meet with https://en.wikipedia.org/wiki/Samantha_Smith and other VIPs.
Note: It might not have been solely due to my grades. I was visiting Kiev on an academic trip in late 2021. The head of institute mentioned that Artek tickets were quite expensive and not everybody with an opportunity actually went. She mentioned price being 200-300 rubles - which was about twice my father's official salary.
But Soviet union from my late grandparents tales was different reality, they used chewing gums and other stuff we considered common as currency much more sought-after by locals than rubles. It makes sense regime didn't want for people tt discover massive discrepancies between various parts of eastern bloc. As whole world saw few years after, mighty soviet union was actually pretty fragile mosaic with pieces desperately wanting freedom from often horrible and incompetent central Russian management.
One of the reason why eastern part of EU is not so happy with uber-centralization in Brussel - we saw what level of inefficiency such approach brings.
Russia does just fine without most of those pieces, whereas the pieces struggle to be viable.
The management was not 'Russian', by the way. It came proportionally from all of the Soviet republics, more or less. When the Union collapsed, they mostly stayed in Moscow.
You don't need any special approval to leave China nowadays, and haven't for a few decades. Hundreds of millions of Chinese people vacation abroad.
Karl Marx's definition of communism was literally "a classless society"
That's not true. Not to idealize anything, there were people, of course, who were poorer than average for one reason or another, but once in a while an average person could actually afford a vacation in Sochi and other areas around Black Sea. (The quality of accommodation is another question, of course.) Also, union members (i.e. pretty much everyone) were occasionally given an opportunity to spend time in spas ("sanatoriums") there. And if you remember, people took vacations that were usually one month-long!
Your experience may very different if you worked in military important factory etc. Second half of eighties was already a very different story though.