Hey, the clichés are ram jhula, lakshman jhula, triveni ghat and the ganga beach. I'd suggest you to go off beat for beatles ashram, shivpuri and neergarh waterfalls.
And try to attend the aarti at parmarth niketan. also, don't miss out on ganga beach cafe, chotiwala restaurant, ganga view cafe and the german bakery.
Simply checkout the link - https://campgangavatika.com/rishikesh.php you'll get all details here. There is lot to explore in Rishikesh. Rishikesh offers 50+ adventure activities 1000+ stays and 100+ tourist attraction. Rishikesh has everything for everyone. Must Visit places in Rishikesh - 1. Camping ( https://campgangavatika.com/ )
2. Bungee Jumping
3. Parmarth Niketan
4. River Rafting ( https://campgangavatika.com/rafting-in-rishikesh.php )
5. Cliff Jumping
6. Waterfalls (Need Garh, Patna, etc)
7. Ganga Beach
etc