Istanbul is a vibrant city but at the same time is full of history. The boat tour on the Bosphorus should be a must for anyone who plans to go to Istanbul. The city also has a great nightlife, with a lot of bars that locals go to around Taksim and more posh clubs around the Europe-Asia bridge. The people are extremely friendly, although some are too friendly that it is a bit eerie.The only downside is that as a solo female traveler, you are likely to be eyed and harassed by some local men.
Insider Tip:If you are a female traveler, please take into consideration that Turkey is a Muslim country and dress conservatively (with the exception of maybe in night clubs) and avoid areas with few people during day or night. Also, avoid going out at night if you're alone.