The Delhi Metro Blue Line covers most of central Noida and is the cleanest and fastest option for getting between sectors. Aqua Line, an independent monorail-style system, links Noida Sector 51 to Greater Noida and Pari Chowk for those visiting suburbs further south.
For everywhere else, Uber and Ola are reliable and inexpensive. Auto-rickshaws are widely available, with shared autos running fixed routes along major arteries — but the fares for foreigners are usually a negotiation. Walking is generally unpleasant: the sectors are wide, blocks are large, and there are few pedestrian paths in good condition. Renting a car with driver for a half-day costs around 1,500 rupees and is the easiest option if you have several stops.