New york city

Hi Girls, not been on here for a while as i work such long hours in summer. Getting a well earned break to NYC in 4 weeks time but what to wear? Still very warm there mid-september and no doubt will be doing a lot of sight seeing and walking. Want to be smart but also comfy. Heels will be a no-go but dont want to look frumpy lol. ANy suggestions pleeeeeease? Thank you, i would appreciate any advise

Dawn xxx