If you'd like to inject a little more culture into your vacation, put Museu da Inconfidencia on your list. Check if guided tours are available or just wander around in your own time.
This Ouro Preto museum is a good place to kick off your day of sightseeing. There's plenty to explore in the area, including Tiradentes Square, Nossa Senhora do Pilar Church, and Nossa Senhora do Carmo Church. Wander around at your leisure at Museu da Inconfidencia before hitting up these other fine attractions.