There are several ways to get from one point to another in City Life.
1. 'Driving by Car'
You can go nearly anywhere you want on the map. The only exception is the island on the top right. Yuu will have to use other Transportation to get there.
The suggested thing to do is to stick to the roads, with most vehicles. As they can handle fairly difficult while offroad. Certain vehicles, such as Crown Vics (Low suspension vehicles) are easily to get stuck on surface changes.
2. 'Flying by Helicopter'
You can go anywhere with a Helicopter if you find a suitable landing area. Helicopters are quite expensive and require a Pilot License in order to buy.
3. 'Calling a Taxi'
You can call a taxi over the Mobilephone. If you are somewhere that is reachable with a car, they will come with a car. If you are not reachable you will get picked up by an air taxi. See Taxi Driver for more.
4. 'Getting a Lift'
Instead of calling a Taxi you can just ask other players to give you a lift.
There are several Subway Train Stations around the map. Open the booth, go inside and close the door. Then you can select the travel Option and go to other stations on the map. This will cost you some $$$. See Underground for more.
During Roleplay or Events, players may drive a bus around. Just hop in and see where it will take you. See Bus Driver for more.