The view at the confluence (called "Sangam") of the two rivers is awesome.
Also do rafting here. You will enjoy it. Ours was an adventurous trip as our boat turned over while rafting. We had all the necessary safety equipment and we rescued within 10 mins. It was fun. They have 3 rafting categories - 8 KM, 17 KM and 25 KM. We did the 17 KM one and it took around 2 hours.