Hi Sue,
The Sithonia Hotel is the sister hotel to the one we stayed in and it was in the final stages of being done up when we were there, and people were just starting to arrive towards the end of our stay. As Shirley says, there is a casino and also a disco in that one, so the entertainment should be more varied than in the Meliton. The beach is mostly shingle type, so I would take some beach-type sandals to wear to protect your feet. The beach bar was good - all drinks were free at the beach bar and in the hotel, so no worries there! We had great weather - it was up to 29degrees on the Saturday! Lovely! There are also the usual beach entertainment crew who will organise beach and poolside games for you take part in if you wish - they're good fun! There's also a little boat service which takes you into Neo Marmaris, the local village - the shops close in the afternoon, so go either morning or evening, and the boat leaves the resort on the hour and comes back on the half hour. If you're a tea drinker, I would take some of your own teabags with you as we couldn't get normal "breakfast tea" till about the Thursday! So, relax, go for it, and enjoy!
Take care
Anne