Brazil 26Apr-3May

Hi! I'm a Spanish guy who will be traveling to Brazil next month. I'll be with my family in Iguaz and Rio de Janeiro for a week, and then they'll return home while I'll have an extra week to travel alone around the country. I would love to get some recommendations on places to visit. I'll start my trip in Rio, but I'm open to traveling by bus or plane to other areas of the country. What places do you think are a must-see? If there are any spots for nudism, even better, but it's not a strict requirement. Also, if anyone around my age wants to guide me or show me around would be awesome. Thank you so much!