I have been to the the Erawen falls , It was so good to cool off after the very hot day . The Commonwealth War graves was a very moving place to pay our respects .
I agree with what you said . As long as the person can read the signs /Reasonably mobile they will be ok . As somebody has said you can get assistance if you book a ride. I was a bit nervous at first time of visiting Suva , But I was being meet by an English mate & Wife . We usually just meet our Family by the Airport police office . Good luck .