Hello Vicky,
I live in Torrevieja, about 5 miles from San Miguel. There's not a lot in San Miguel itself, it's just a small town. There is a street market once a week and no shortage of bars. You are not far from Torrevieja town, where you will find anything you want. Every day during Semana Santa(Holy week) there are parades throgh the streets, check out fiestas at www.comunidadvalenciana.com for details. You'll have no problem finding a hire car, every Imobilaria (Estate agent) has an agency for someone and there are thousands of them. Torrevieja also has a medieval market on the sea front (Paseo Vistalegre) from Wednesday from 10am till about 2pm then again from about 5 till about 10pm, usually with entertainers and well worth a visit.
Enjoy your holiday.
Mike