Try Q Mango forest near Ramanagara, They're providing some fun activities like Zip-lining , Rock rapelling, and others along with a tent stay. Much recommended for big groups.
You have Guhantra; mango mist. you can check out my link Spend your time this summer-India’s underground cave resort 'Guhantra' #summerescape #IssSummerBaharNikal https://tripoto.page.link/Kne8 I have blog on 2 other resort... you can go through it n decide.