Is there a river cruise for only 2D1N? How much US dollars? is it ok to travel last week of June?

Oh, generally speaking, the river cruise on Yangtze River takes 4D3N or 5D4N. So your travel plan is a little bit tight.

To have a good experience, you can join a tour of Travel China Guide. They provide 4 Days Yangtze River Cruise. The expenses are different because of the different standard you choose. It is up $439 per person. June is a good month to sightseeing. So don't worry.
If you want, the contact information is traveltravelchinaguide.com.

Enjoy your trip.