Try the Kodachadri trek. Please read my blog titled "unexplored path to Kodachadri hills through mookambika wildlife sanctuary". You can get all the information regarding trekking to these hills through the forested regions. the blog is available in my profile.
Hi check out my Tripoto profile #Doityourself one day wondrous trekking spots near Bangalore, India under 500 bucks - these are amazing within low budget also nearby Bangalore. Also I've blogs on Kudremukh and Baamikonda which mind blowing trekking spots in Karnataka. Let me know if you have any questions.