You can also take a hike to or around the caldera Quilotoa.
Depending what you choose, it may take a few days or just 1 day.
The total distance is not so big, but the elevation, up to 3900 m, may be quite demanding. So don’t forget about the altitude sickness and be aware of first sings of it.
When I was there, there were only a few people hiking, but other seasons are more crowded.