Las Americas together with Los Cristianos and Costa Adeje is a city in the south of Tenerife. The different names are part of separate regions but are otherwise indistinguishable from each other. The city was built for tourists and is mostly made up of hotels with plenty of beaches and restaurants. English is spoken almost universally so language will be no barrier here.
Beaches are what many tourists come here for. Sunloungers are available at a few euros a day (or just buy a parasol and take a beach mat). The beaches are busy during all sunlit hours, although it is perfectly warm enough to swim in the evenings too.
Las Americas is where you will also find the liveliest night scene, with Veronicas and Starco being the main clubbers' attraction. More family based entertainment can be found in 'The Patch' and San Eugenio/Torviscas areas.