Sulllia is about 85km from Mangalore (Mangalore is head quarters of Dakshina kannada district). It is 330km away from Bangalore. You can reach sullia via Mysore or via Hassan and Puttur. You will get buses from almost all major places of Karnataka to Sullia. There is no railway facility to Sullia.
The best mode of travel is local buses, private service vehicles. Both government and private bus stations are located nearby. Many times you will hear loud voices quoting your destination (Example :Guthigar, Bellare, Puttur). Just approach them, they will lead you to the appropriate vehicle which travels to your destination. On the contrary, government buses shall flee in designated times and you have find timings at enquiry counter located in Government bus station (locally called as Bus Stand).
The best natural drink Tender Coconut is available in summer. Its hardly INR 10 (USD=0.3). Also plenty of tiny tea shops offer you tea, coffee etc just for INR 2 (USD=0.03)