Adding to the suggestions below of places to visit in and around Mangalore. About 60 kms away from the city, there's St. Mary's Island where the shore is mostly shells and rocks and less of fine sand. To reach the island you'll have to take a bus from Mangalore to Malpe then catch a ferry from malpe beach to the island. Cuisine wise, Sea food preparation like Sukka, ghee roast, Seer fish or pomfret tava / masala fry are a must try. Some of the famous places you'll find them are giri manjas, machli, meen ootada mane. Most of these places can be found on zomato as well. Mangalore is also known for its gadbad ice cream at some of the local joints especially Ideals ice cream parlor / pabbas ice cream parlour. Travelling inside city limits isn't that hard as the bus service to most places in the city is well connected. Apart from that you can also use auto rickshaws or cabs (ola/uber) or self driven cars (zoomcars) are also available for rent based in your needs.