Hi Maree -- My partner and I are also arriving 2 days early to Istanbul and staying 2 days later in Athens but did not book pre or post package through Olivia. So, we're on our own for excursions. We are definitely interested in visiting the Grand Bazaar and Spice Market. We wish we could do the Bosphorus Ferry but don't think we'll arrive in time to catch it on October 1st, and we want to leave Saturday for Grand Bazaar and Spice Market.
I am finding the research for hotels in Istanbul to be a little bit more difficult... we don't know want to stay on the bad side of town, and don't know the pros and cons in staying in the Asian vs European side. So, we are still researching and asking people who have traveled there. As for Athens, we've got a list of 3-4 hotels highly recommended but continue to monitor the prices. We typically focus on hotels that are in safe locations and nearby major transportation (the latter saves us a lot of money). Let us know if you'd like us to share the hotel names.
We'll be happy to meet with you in Istanbul and/or Athens if you wish.
Abs