You could walk it up to this cycle store from Grant Road and watch the world wake up, but if you aren't really fond of walking, then take a cab from B Merwan to Anil. Run by two brothers, its a cycle garage cum store that lends both normal and gear cycles, and there's no deposit required. Of course its a second-hand cycle, but Anil makes sure the tyres are pumped and everything works. You can take the Cafe Ideal route and head to Marine Drive to cover the whole stretch.
Cycle On Rent: INR 50 for an hour