Hey saurabh, There are plenty of 1 day trekking destinations near Bangalore.
1. Savandurga hill
2 Ramanagara
3. Nandi hills( My favourite)
4.Skandagiri
5. Makalidurga Hope this helps . Happy travelling Rashmi Shetty
Kumaraparvatha is the best place for trekking.
But you should also keep in mind the place to stay above the hills is called as BattaraMane which is just so so. They serve food upon order, Only Veg