Yes, it is possible to take a tour from Praiano to visit Sorrento and Positano. The tour would likely include transportation to and from Praiano, as well as a guide to lead the tour and provide information about the sites. Sorrento is a charming town known for its beautiful sea views, historic center, and delicious local cuisine. Positano is a beautiful coastal town known for its colorful buildings, picturesque streets, and stunning views of the Mediterranean Sea. The tour may also include visit of other towns like Amalfi and Ravello, depending on the tour company. It is recommended to book the tour in advance, as tours fill up quickly and it is better to be sure of availability.