Marina is beatifull during the day to sit outside for a coffee, or come for lunch or just for a walk. In the evening there are few very nice restaurants to choose from, such as Pure Passion. The area is quite posh with nice apartments behind closed gates.
We strolled down to the marina along the beach from tikida Dunas. It's a bit more up market than most of Agadir so prices are higher but still worth a look. Sad to watch cruise fodder trekking by in their crocodile lines but sit back and relax at the marina cafes as you see them follow the leader
The marina has a number of very expensive shops in the vicinity. It also has some very good expensive restaurants but also cheaper restaurants right next to the marina. Orange taxis are very cheap and will take you to most places for 20 dirham (about £1.80 ). Don't expect them to be well maintained!
The marina caters more for the well off morrocans. For tourists it's fine as prices are similar to the UK although the restaurant are still better priced than the UK. Not an awful lot to do around the marina apart from chill and have food or ice cream.
During our recent stay in Agadir, we took a daily run to the Marina and it was beautiful. The Marina has great shops and restaurants and has a really nice atmosphere. You can also take sea day trips from here. Would defiantly recommend a visit or two to the Marina.