Santorini has a lot more to offer than spectacular sunsets.
You also have white washed alleys and blue roofed churches. Walking among the maze of alleys between building can be quite an adventure in itself.
If you are looking for something off the beaten path....
There is an awesome 6.5 mile hike from Fira to Oia along the caldera cliff. Since we were staying in Fira we decided to walk from Oia back to our hotel. We took an early morning taxi from the hotel to Oia. Our taxi driver gave us an excellent recommendation for a little bakery for breakfast before we began our walk. The walk can take anywhere from 2 - 5 hours depending on how many photos you stop to take. The view are amazing so you need to plan accordingly.
For those that like a little more adventurous how about a walk up Skaros Rock. The view from the top is amazing no matter when you go, but do it for sunset and you are guaranteed one of the best seats in the house. This is not just a simple walk along a path, be prepared for a little scrambling and climbing over rocks in a few sections.
Want something a little easier. Enjoy the view from any of the restaurants along the cliff. Morning coffee for the early risers or an evening drink for the night owls. There is something here for everyone.