What area? Generally anywhere that: doesn't have a sign saying no parking (like an alley or driveway, which actually don't need a sign for that to be true), isn't in front of a hydrant, doesn't have time restrictions because of a permit situation like some neighborhoods, isn't metered like you said, isn't handicapped assigned, and doesn't have city posted signs about towing like for upcoming road repairs, then you're good. That's not an exhaustive list but by and large there aren't really any "gotchas" in terms of parking.....the surrounding signs, and stuff like hydrants and driveways, will basically tell you everything you need to know