After you join the Priority Club Rewards, you will shortly receive few emails about the program and some of them might include a link to a quiz that earns you points. Last year, you could easily get 2000 points for completing number of them as I documented here.
This year, you can still earn 1400 points IF you have not completed these previously.
Survey 1: 300 points
There are total of nine links to this survey in English (US), Spanish, Japanese, Chinese, English (UK), Portuguese, Italian, French, and German.
Survey 2. 100 points
There are total of nine links to this survey in English (US), Spanish, Japanese, Chinese, English (UK), Portuguese, Italian, French, and German.
Survey 3. 100 points
There are total of nine links to this survey in English (US), Spanish, Japanese, Chinese, English (UK), Portuguese, Italian, French, and German.
Conclusion
You can do each survey officially only once. It seems, however, that you can some of them more than that.