Following are some spots in Rishikesh with the view of magestic view of Ganga River.

1.Ganga View Cafe 

2.Freedom Cafe

3.Little Buddha Cafe

4.60s Beatles Cafe

5.Cafe Karma

You can find many more cafes there, but these are some of the best ones based on the customer reviews.

Coming to the jamming cafes, so yes there are live jamming cafes in Rishikesh.

Some are: Open Mic Cafe - Indian Conti Chinese Food. Open Garden Live Music - Jammin-Story Telling, Tree House Ganga Cafe, Shambala Cafe etc.