The best tapas experiences I've had in Spain have been outside the main cities; Logrono isn't usually on the radar, but it's worth stopping by, and one of the better ways to spend a Friday evening there is to go to the city center and wander between the bars. Most of them have a specialty of some kind--razor clams, cuttlefish, mushrooms with garlic, etc.--and you may have to squeeze past what seems like half the city to place an order in some establishments. I should point out that La Rioja produces great wine (though it's not the only area in Spain to do so), and I'd recommend just about all of it.

Funny place. Good food and wines.