Depends what you want and where you are staying, local advice roughly in order would be Dornoch, Brora, Tain, Fortrose, Golspie as traditional, Castle Stuart what people say, some great holes and decent modern course but I'd go to both Nairn courses first then Lossie and Boat Of Garten.
If you want signed on to Brora give me a shout or PM for more info, I'm sure some others will chirp in.