Unawatuna is a coastal village in Galle district of Sri Lanka. Unawatuna is a major tourist attraction and famous for its beautiful beach and corals. The description of the beach paradises in Valmiki's epic Ramayana sounds like Unawatuna.
Easiest way to get around is by tuk-tuk. Day trips to Dutch Fortress in Galle, Martin Wickremasinghe Museum in Koggala, Hikkaduwa, Weligama, Mirissa, Ahangama can be fun on a tuk-tuk. Deal with the driver, make sure there are NO hangers on, or you will be taken for a ride. They can be hired for the whole day, just the trip or to be dropped off some destination. Most of them can be contacted by mobile phone. Get an idea of their charges before hand.
Longer trips and round tours can be arranged with car or vans. Public transport trains and air-con buses are the cheapest mode of transport.