You can get to the Asian coast of the Bosphorus, to the Princes' Islands (adalar direction) or swim all the way to the Black Sea (Anadolu) and visit the ancient fortress of Yoros
There is a public transport dock to get to the Asian part of the city. The fare is paid with a public transport card, the cost is 20-25 TL, the travel time is 20 minutes
Very convenient. Go to the ferry according to the schedule on the istambulkart and in 15-20 minutes you will be on the Asian part. Back according to the same scheme, only with a call to kadekyu.