When it comes to taxis, it might be better to take private ones than the public taxis that one hails on the road. Private ones usually only have you as the fare for the duration of your journey. Public taxis drivers will fill the vehicle with anyone who hails them, so you would most likely share a cab. There is no state-owned public transportation system at the moment. Instead, longer distances are also served by mini-buses which are typically the size of minivans but which are equipped to seat more than 7 persons.
Accidents are often spectacular.
I would avoid mini-buses more than I would avoid a tarantula. These can be chartered. There is a risk of malaria in the interior, but not in Gergetown and other coastal areas. Georgetown has one public hospital, the largest in the country, and several good private hospitals. As with any fairly large city with a diverse population, Georgetown is not crime free.