Postgraduate studies were very similar to undergraduate for me. I had access to the same facilities, societies, and sports clubs. However, the main differences lay in the expectations and the cohort.
In undergraduate, most students came from similar backgrounds, while in postgraduate, there was a mix of individuals with extremely different backgrounds. Some had degrees in engineering or physics, others were proficient in business, and some even worked on their own startups. As for expectations In postgraduate you are expected to produce a higher standard of work in a shorter timeframe. You are expected to know the basics (though there are short catch-up courses) and be able to continue to develop/ and advance those skills.