Yes, you can. There are many sites around Shetland that offer a fair to good chance of seeing whales, dolphins and porpoises. You can download a map of these sites here.
We suggest you download the Sea Watcher App (see here) and record your watches using the App. That way any sightings you see are captured by Sea Watch and can be shared quickly. But also please post details of any sightings on the Shetland Orca Sightings Facebook page.