This map has plenty of room to run, taking place in Singapore (similar to Aquarium) in the middle of an abandoned evacuation zone, right in the middle of a large complex. Here, you'll find no shortage of interiors to hide out in, although there are some good outdoor areas as well if you feel like getting in a skirmish in the open.
The map is a little bit bigger than Combine, so you should be able to find better maneuverability around the edges instead of simply running through the center. Watch out for the smaller rooms, though, as some soldiers could be waiting to get in a close-quarters combat scenario. Watch out in the center as well – there will be plenty of foot traffic here.