I’d recommend Sukhumvit! It’s perfect for first-time visitors because you’ll find everything you need there—cafes, bars, shopping malls, and even cultural spots. There’s a BTS Skytrain line running through it, so you can easily hop on to explore the rest of the city. Sukhumvit is also known for its nightlife and international vibe, but it’s super easy to find quiet spots, too. I stayed near Asok BTS station and it was so convenient to get around. Definitely a good mix of local and touristy!