Skaithos and Skopleos are certainly the more popular and well known islands in the Sporades. If you want to venture beyond those islands and find yourself somewhere a little less fast-paced, try Alonissos. Just as beautiful, Alonissos is very serene in comparison. It has a marine park in which dolphins and monk seals have made their home.
Have a look at some other destinations to inspire you to go on your first solo travel trip!