Simpang Lima, or Five-way Intersection, is simply a massive roundabout with a large park in the middle of it.
What makes this particular place appealing to visitors, however, are the shops and malls around the outside of it which provide a welcome relief from the midday heat.
It's a perfect place when you have a few hours to kill before your onward journey and you are certain to find something decent to eat around here because of the large variety of malls. Just don't expect to be immersed in the culture of Central Java as you might be when leaving the city.
Getting to Simpang Lima from most hotels will require the use of a becak or taxi unless you're prepared for a walk of a kilometre or so. From the old town, it's a 3km haul which will well and truly test the fortitude of those wishing to walk it in the heat of the day.