Sure thing. We did not get out to Palmeraie at all, but as for Marrakech city:
- Buy yourself a proper city map from Amazon, they're a few pounds and well worth it as it's impossible not to get lost! Don't check maps in public, if you need to stop to check it then pop into a cafe. The locals tended to 'volunteer' themseves every time they thought we were lost (hoping to make a tip I think?). One fellow followed us for quite a way even though we kept insisting we knew where we were going!
- Take out cash at the ATM in the airport. You can't buy dirhams in advance (except after clearing customs at the airport) and the rates for currency exchange places in the city aren't good.
- Some good places we found to have a break in the medina were: Cafe des Epices (lovely rooftop terrace - at 75 Rahba Lakdima) and Dar Cherifa (8 derb Cherfa Lakbir). I loved the Moroccan mint tea, it's a must-try, as is a good tagine.
- Wear modest dress when out and about during the day. Tshirts with loose trousers, jeans or a long skirt would be fine, but avoid showing cleavage or bare legs (even shoulders if you can). Most men and women cover up and anyone showing a lot of skin sticks out like a sore thumb. I'm sure you'd be safe even if you didn't, but be prepared for people to stare - even the men didn't seem to wear shorts.
- The best sights we saw were the royal palaces, the Saadian tombs & the Jardin Majorelle. There is not much guidance at any of the attractions, especially in English. If I were to do it all again I would look at going along with a tour guide. I believe there are official ones about.
And lastly, just to keep this on topic - keep your makeup simple, light and hot weather friendly. It was quite humid when we went and I ended up wearing just the very basics. I wore my Urban Decay shadow pencil in Sin quite a lot, it's so easy and budgeproof.
Hope that helps