awooga83 if you like pizza, Demaio is worth a shout, Los Tacos de 10 is lovely if you like... tacos. That's right near the stadium. Also, give a Calimotxo a go. Red wine and Coke, it's way better than it sounds.
There is a long street of bars lasting right up to the San Mames, Poza Lizentzia but obviously I went there as a home fan, not a visitor.
Final tip - have a great time, it's a wonderful city!