There are somany places to visit. Golconda, charminar, birla temple, tankbund, Ramoji filmcity etcc..
And for food, you can eat good biryani at paradise hotel, shdaab, bavarachi, @rtc cross roads and haleem at pistahouse. And much more.
This is Ramzan time, so definitely visit Charminar at Midnight and have Haleem there. Golkonda fort, Salarjang Museum, Necklace Road ride, Birla Mandir, Mucca Masjid, Gokul chat Market in Koti, Yerragadda sunday Market are some places worth visiting once. Food, I suggest Pista House, Bawarchi, Paradise, Alpha and some other in Hyderabad are famous for Non Veg Biryani especially.
Hyderabad has a lot of eateries and different cuisines to choose from if ur opting for Arabaian please visit barkas for different types of Arabaian food
if ur opting for Chinese please visit Nanking,bowl ochina
or else visit paradise,bawarchi,shadab,ohris,
For best biryani Paradise biryani Secunderabad
Best places to visit Charminar
Salae jung Museum
Golconda fort Bhudda statue and Necklace Road
Eat street for food at Necklace Road
And for more info visit my profile for hyderabad must see
1.salar jung museum( it is really big and it is a must see)
2. ramoji (one day wouldn't be enough)
3.golkonda fort ( and light show)
4. hussain sagar - boating and laser show
5. also if yo want to enjoy snow - snow world... the other places around snow world are not worth the hype
6. necklace road for shopping
7.chowmala palace - go before 5pm entry closes at 5 pm