Personally I would stay well clear of Playa de las Americas (seriously tacky, timeshare touts in your face, dubious characters saying "you come into my restaurant, nice place", and so on) unless going to the quite pricy Playa del Duque end. Golf del Sur may be quieter than you'd like, but it might be worth looking at Los Cristianos. All of these are about 15 - 20 minutes from the airport.
You could also have a look at Tripadvisor.com which I think is a fantastic resource. There are reviews of resorts, hotels and attractions by people who have been there, and there is a very useful forum too.