Hi Suzie. You're probably looking at Miami Playa. It's a very small town with a few shops, bars & cafes, banks and a supermarket. I love the place and have had a few holidays there with my parents as I lived nearby. There are a lot of Germans and other nationalities, including British, who live there full time and the place is packed with holidaymakers in the high season. Well worth a visit - especially playa Cristal which is the beautiful beach. You should also venture further south to L'Ametlla de Mar and L'Hospitalet de L'Infant, both lovely towns.
I think there will be a bus that goes from Cambrils. The train goes through Miami Playa but there is no station there. Sorry I can't be of any more help on this subject - can anyone else help ?
