There are several things to bare in mind when thinking about using a cycle rickshaw.  First they are not fast, and even getting started can very much depend upon the size and fitness of your rider.  Sure the younger kids tend to be cheeky and more enthusiastic, but at least make sure they can reach the pedals.  Secondly there’s not much protection in them, so in slow moving traffic (such as Old Delhi) they are fine, I’d not like to be on one any where were cars can move freely.  Third there are issues with suspension, or more accurately there is none.  Net result is you can be thrown forwards when it hits even the smallest rut in the road, so sit back and use your legs as braces on the foot rest.  And finally have a sense of humour and do not be in a hurry …