Iguape is beautiful, but if you can visit Sobral, which is in the interior of the State of Ceará, it is only 3 hours away from Fortaleza. Sobral has the 2nd highest HDI in the state and good hotels, research and visit it, you won't regret it!
If you're big into beaches, I'd suggest Maraú (BA), Alter do Chão (PA - the best beach in Brasil according to The Guardian) and my personal favorite Fernando de Noronha (PE) which is simply stunning! I hope you enjoy your stay and you're always welcome.
