The main dilemma here is likely to be choosing where to go for the best quality and good value dining. The standard and variety of restaurants have improved over recent years and you can, increasingly, find more sophisticated places to eat, as well as traditional Spanish and Canarian fare. Avoid restaurants that advertise their international cuisine with sun-bleached pavement posters. On the waterfront in Los Cristianos' port area is a row of kiosks, including Pescaderia Dominga, selling fresh-off-the-boat fish.
Bars and restaurants throughout Tenerife are heavily suffering as hotels here increasingly offer half-board all-inclusive deals to their guests at cheap-as-chips prices. Hotel buffets are typically based on bland international cuisine aimed at mass consumption. Try to spread the word to support local restaurants and bars, before still more se vende ('for sale') signs appear.