Calle Montayo (Fish Alley) in Fuengirola has restaurants that cater for every taste. None would stay open long here if they did not measure up, so I cannot think of any you must avoid.
At the top end of the scale, those either in Fish Alley itself, or very close to it, include Portofino's, Don Pe, Casa Roberto, and Moochers. Poncho's, opposite the bowling alley and near Hotel Palmares, serves up superb Argentine steaks. Ku Damm, at the port and right on the harbour, is great for a fixed-price lunch or dinner.
Busiest restaurant in Los Boliches is Cheers. Good, honest English grub here and huge portions. Pretty much a cafe setting, though. Better still is Wolfgang's 150 yards or so up the Paseo Maritimo.
Paloma in Los Boliches is tops for pizzas, while the best fish and chips in town can be found in La Parra (behind Hotel Confortel, Calle Poeta Salvador Rueda). Bulgarian waitress here is worth her weight in gold.
Plaza San Rafael (statue square, at the Confortel) in Los Boliches has an ever-so-plush Chinese eaterie, and near it, facing the sea, you have the ever-popular Carihuela, which is Spanish-owned.
Lots of choices other than these few. Enjoy.