A good (and very easy) thing to follow for supercurricular ideas is the British Psychological Society. This will give you plenty of ideas for careers, research and university choices. They have made it super easy to do.
When looking at these though its a good idea to keep some sort of refection journal. What did you thing about what you read? What questions did it throw up? Where would you take the research next? By the time your write your personal statement, you might have forgotten these so writing it down will help make your personal statement less descriptive (“I did…”) and more analytical (“and I thought…”) which the top universities are looking for.