Where to buy an Indian SIM card and to print documents in Rishikesh:
Swargashram - Om Printing - opposite Gita Ashram
Tapovan/Gulab Nagar - the first nameless shop in front of the Intergovernment College
Laxman Jhula - 2nd floor of the building next to Lotus Cafe
These shops also sell common electronics for laptops and mobile phones such as USB charges, adaptors and memory cards. Some bigger hotels may be able to print things for you at a cost but it is really better to go to these print shops where charges are nominal.
Hospitals / Clinics In Rishikesh:
Clinics in the tourists parts of Rishikesh focus mostly on ayurvedic treatments. If you need a general practioner, you will be better off going to one of these hospitals for their outpatient services. They have been known somehow to be good by tourists although if you read online reviews, many locals have differing opinions. For more serious operations, you will need to go to the hospital in Dehradhun (hopefully not!).
Hospitals in India are very crowded and services can be haphazard. It is advisable to go with a local if you do need one so they can bring you to the right place. If you just need medicine for some simple sickness, you might be better off googling what kind of medicine is required or call your doctor at home to ask and simply buy them from the many pharmacies in Rishikesh market. Most of the time they are lenient about selling medicine to tourists without prescription. Of course, if you do not know what you are down with, please see a doctor!
There are a few Facebook groups (public and private) which are useful for updates on events and happenings in Rishikesh. These are focussed on more generic discussions while some others are may be specific to certain activities in Rishikesh. You could also post your requests such as for long-term accomodations (well-responded to most of the time), questions on very local issues, questions on where to buy specific items, etc. There are a good mix of local members as well as tourists in these groups.
Any other things you might like to know as a tourists? Post it in the comment section below and I will try to find the answers for you. If you have a business and think that it is useful to travellers in Rishikesh, drop a note to be included in the list.