Jhulas Ram and Laxman Jhulas named after two legendry brothers of Ramayana are suspension bridges on the Ganga and sway gently as one walks on them to cross the river. The view of the fast moving Ganga is marvelous from the centre of the bridges.
Ashrams These ashrams are centre for spiritual studies and yoga and are frequented even by many foreigners for learning this art. Some of the famous ashrams are Sivanand Ashram, Omkaranand ashram, Yoga Niketan and Swargashram. 
What to do
White water Rafting

Rishikesh has established itself as one of the places in India for white water rafting. There are many camps which start just after Rishikesh and go up to Kaudiyala and Shivpuri providing both the accommodation along the white sand beaches of Ganges and also white water rafting. Click here for more on rafting and Camps at Rishikesh.

Trekking Rishikesh can be made as a base for treks into the Garhwal Himalayas offering religious, scenic, botanical to adventure ones. There are guides available in the city if needed. Two interesting treks around Rishikesh are to Neelkanth and Kunjapuri temple.
Rock climbing Places around Rishikesh like Kaudiyala, Tapovan and Thekla provide ample opportunities for rock climbing and rappelling.

Bungee Jumping

One of the few places in India providing a safe and well trained team to do Bungee.
Wildlife Chilla Range, Rajaji National Park is about 8 km from Rishikesh with a good elephant population. Other animals include wild boar, nilgai, sambhar, spotted deer etc.