You can try the Doha Food Festival, opposite the Exhibition Centre tomorrow from 11AM till 10PM. Else, you can go to some Beach towards North like Al-Ghariya or Fuwairit Beach...or South West like Zikreet or Dukhan etc. Sheraton Park at Corniche is also a nice option for a Picnic Lunch.A movie at any of the Cineplexes is not bad either.