Travelled to Agadir with my mother, my teenage daughter and her friend for a week, and spent one full day relaxing on the beach.
* Sunchairs are around €2-3 for the day - make sure you don't pay over this, but using the sunchairs is worth it as it does give you a feeling of security and makes it easier to ignore the beach sellers.
* If taking a taxi to the beach from your hotel, promenade = the end by the port and la plage = what taxi drivers refer to as the beach at the very opposite end to the promenade.
* Women going in to swim, be aware that you may need to be very assertive to get rid of unwanted male attention. I was swimming with my teenage daughter and her friend and a local male thought that meant he could join us and attempt to grope us underwater. Shouting and splashing him was the only way to get rid of him - you will need to be extra aware of people around you if swimming without a male in your company.
* Henna tattoos, while these are very good (you will have women coming around to offer to do tattoos for you while on the sunbeds) make sure that you agree a set price before they start the tattoo. If you show the slightest interest they may just start the tattoo, and the price they start with will be very high. We paid for two, and while my daughter was having hers done, despite being very clear at the start that I wasn't having one, there was a henna started on my leg also. They would not leave without some payment for mine, I only gave €4, and for the two hennas for the two girls we paid €15 in total.
Overall, it was a pleasant and relaxing day, just be very careful of the sun as the day we went it was overcast with a slight wind - and was the one day that we all got sunburned!
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.