My experience was good. this city is quite isolated from the other because the road access are really bad, i suggest you to go there by train instead by car, the traffic is bad and mostly jammed everytime.
Sukabumi is one of a beautiful city in Jawa Barat Province. its still look natural, with mountain surrounding the city, so the temperature is cold enough, fresh air everywhere because many tress there.
many attraction in sukabumi we can visit, from the city its self, lake, garden, and beach.
Sukabumi located between mountain and beach. So you can either climb the twin mountain Gede Pangrango or playing at Pelabuhan Ratu beach or Ujung Genteng beach.
Go for street food! Though it's not really special, but Sukabumi has lots of street food that'll take you back to your childhood memory.
You can try "bandros", some kind of sweet snack, accompanied with "wedang ronde" at night. Go up hill to Selabintana area and breathe as many fresh air as you like. If you live in a big and crowded city like Jakarta, you can find a relaxing moment here in Selabintana.
Sukabumi is small town in West Java, it takes 3 hours by car from Jakarta if not traffic, but if it is traffic, became 5 hours.
The environment is good as it is cold there and there are so many nice panorama such as mountain, rice field, waterfalls and beach (the famous beach is Ujung Genteng).
this the place that if u like outdoor activity and like suborn area this would be a nice place to visit