Average cost varies between 15K to 20K for a week to spend in any part of Tamilnadu. There are lot of travel houses offering packages to Tamilnadu, kindly check. I hail from Tamilnadu, will share a few must things you can try exploring when you are travelling to Tamilnadu, see if it is suitable for your travel. -If you are visiting Madurai, don’t forget to drop in at Gandhi museum, taste halwa at Lala shop, buy Madurai Malli and shop for Pooja items especially Thazhampoo kumkum. -If you are visiting Coimbatore, don’t forget to visit Sai mandir, Velliangiri hills and pachamalai trek
-In case of Tirunelveli, their murukku, sambhar and Nelliyappar temple is a must to visit. -Kanyakumari has some best beaches, seashore temples to visit, also shop for unique seashells. -Tiruchirappalli visiting Srirangam, rock temple
-Kumbakonam is a temple town where you shouldn’t miss degree coffee
-Ooty, Kodai, Coonoor, Kotagiri, are lovely hill stations you can try exploring. Don’t forget to taste varky biscuits, homemade chocolates and oils. -Finally capital city Chennai, Marina beach, Parthasarathy temple, shopping at Ranganathan street, Dakshinachitra, Crocodile park, Connemara library and OMR road drive.