If you are in rishikesh you must visit neer waterfalls it is very peace giving. You can go to Dehradun there are many things to do. You can visit Tapkeshwar Temple, Guchhupani, Sahasradhara and Tiger Falls is the must visit place near Dehradun. If you have extra day you can also go to Mussoorie and Dhanaulti.
Places to visit near Haridwar: Dehradun Mussoorie Kanatal Lansdowne Sattal Auli Kasauli Some places are far away but still it will give you the most awesome feeling and adventure if you are planning for outing then I suggest you to go to Auli.. Best place of attraction Nainital.