Turn left and you'll walk towards San Agustín resort. The first section runs behind the dunes and the Annexo II strip of restaurants by the beach. Walk on and you get to El Cochino beach (all three of it). Then there's Las Burras beach, and eventually, after a lovely rocky headland, San Agustín beach itself. Pick a spot for a first drink in the sunshine anywhere along the route, or take a towel and jump into the sea.
Turn right when you get to the dunes and you'll run out of promenade at the brand new lookout point in front of the big White RIU hotel. This is the spot for selfies and people watching. There's constant stream of people walking in and out of the dunes.
From the viewpoint turn inland and walk up Avenida de Tirajana. Most of the big shopping centres are to the right of this road and it has plenty of bars and restaurants of its own.
For food just pick a shopping centre. There're so many choices that it pays to do some research beforehand. Check Tripadvisor and look at our Best Playa del Inglés Restaurants list for a curated selection.