Air-conditioned vans to/from Surat Thani airport cost around 100B per person and they’ll drop you off at your hotel.
To travel around town, a sŏrng·tăa·ou (pick-up minibus) will cost 10B to 30B (it’s around 30B to reach Tesco Lotus from the city centre).
Fan-cooled orange buses run from Phun Phin train station to Surat Thani every 10 minutes (15B, 25 minutes). For this ride, taxis charge a cool 200B for a maximum of four people, while share taxis charge 100B per person. Other taxi rates are posted just north of the train station (at the metal pedestrian bridge).