Hello, I think you could ask a reliable travel agency to make a private travel plan for you in terms of your requirements.

What do you mean by dune? Is it Bund? Well, the Bund and Pudong is divided by the narrow Huangpu River on which there are very frequently ferries operating. The ticke of night cruise along the Huangpu River could be bought just at the 1F of the Bund. In fact, there are lots of ferry companies there. But, don't buy ticket from those small booths although it may be a little cheaper. All of the taxi could take you there!

1. usually 2-3 days in quite enough for Shanghai tour, but if you want to pay some one day trip to around cities like Suzhou / Hangzhou / water town, the days will be added more.

2. taxi / metro will be very convenient for you. if you go from the bund to PUdong side, the best way is to take sightseeing tunnel.

3. just go to the bund, you will see plenty of river cruise ticket booking office, buy the tickets you need there.

btw, night river cruise usually is 80-100RMB/person, one exception is dragon boat ( the biggest one) 200RMB/person with buffet dinner on it, leave at port at 7pm.