For a 1 day getaway from Bangalore, with a trip full-on adventure and sports… try Anthargange.
You can leave from Bangalore by early morning ( 4AM – 5AM ) and return by evening 10PM or earlier.
In Anthargange, you can visit temple the first thing and start with Bouldering. Then after you can have lunch and start with Caving. You may get some guide fellow, many of them are kids, who will guide you in Bouldering and Trekking + Caving.
Note: There are water caves as well, those are with very narrow passage and very slippery rocks. A place where only one person can go at a time. So if you are claustrophobic, do not attempt it. Well I’d say for general people as well – DONT ATTEMPT IT unless you know what you are doing and you have done Caving and similar adventures before. For us we’d done caving before and yet it was almost very tough for us.