Using the public transport is a good way to get the feel of a place. €4.50 for 24 hours travel on any public transport in Athens is a good deal. Google Maps is also extremely helpful, with health warnings, in making suggestions. So we got to the National Botanic Gardens in good time.
Other observations: Very few joggers. Most of the motor cyclists without helmets are male. The Greek script takes getting used to, pay more attention in school!