You should take the bus or taxi to uskudar from Kandilli first.

Then, you will be taking a motor boat rather than a ferry because the regular ferry from Uskudar to Eminonu may have stopped running.

And, I think the motor boat, which is like a small ferry, and runs next to the ferry landing, using istanbul card or the standard ferry tokens, just crosses the Bosphorus to Kabatas which is the end of the tram line.

this return is simple on a week night and with heavy traffic on weekends.

Another question, we have an Istanbul greeter meeting us our first day. getting us familiar with the city and its people. Does anyone have any idea what tip might be appropriate?