Another restaurant that you can try, "La brasserie du sud ouest", here's the adress : 275 Cours de la Somme, Bordeaux, phone : 05 56 92 03 06. Another good one, "La belle époque", 2 allée d'orléans, Bordeaux, tel : 05 56 79 14 58 (you can eat some coquilles st jacques, foie gras de canard, encornets au piment d'espelette, langoustines, agneau braisé...).
A "cheese restaurant" : Baud et Millet (this is really rare, never tried this one but it's really specific), 50 cheeses + wine, 19 rue Huguerie, Bordeaux, phone : 05 56 79 05 77.
If you have some time to spend, you can have a look here to prepare your travel and to see what could be interesting for you to visit.
I guess you won't stay in the town during 1 month with this heat :) So for the beachs, the intersting ones are : "Le bassin d'arcachon", "le Cap Ferret", you can visit the "Dune du Pyla", wich is really nice but La dune du pyla is not a beach. See also Biscarrosse.