Yes. There are still many things to do. You can drive different vehicles that you may not have fully explored during the story mode. You can also look for collectibles scattered across the map. The city is still full of life and opportunities for different kinds of gameplay experiences, whether it's causing chaos on the streets or simply enjoying the scenery while driving around.
Yes, you can. There are often a lot of side activities, like exploring the city, doing random missions, and participating in mini - games.
Sure. After finishing the main story in GTA 4, the game world remains open for you to continue playing. You can engage in various post - story content. For example, you can go back to your safe houses, drive around the city to discover hidden areas, or interact with non - playable characters. There are also some bonus missions that you might not have unlocked during the main story that can be accessed and played at this time. It's a great way to further explore the detailed and immersive world of GTA 4.