I was last there 10+ years ago, but the lake in the center of the city (https://maps.app.goo.gl/yVzEBmEbc8Qu6rC98) had a few parks around it and was pleasant to walk around.
Biryani is the local favorite food. Paradise is(was?) a popular, if touristy, place to get it: https://www.paradisefoodcourt.in/
Golconda Fort was impressive: https://www.lonelyplanet.com/india/andhra-pradesh/hyderabad-...