BTS is Bangkok elevated rapid transit system, which is known as Skytrain. With BTS, you can go to the major areas in Bangkok without facing traffic jams. Currently BTS has 2 main lines: Sukhumvit line and Silom line.
Ari is a BTS station on Sukhumvit line that is located on Phahon Yothin Road, near Phahon Yothin Soi 7 or Soi Ari.
Here is the map for the area around Ari BTS Station. I have got this map from BTS official website. The area map for the other BTS stations can be found here. To enlarge, click at the map.
What to see around BTS Ari Station
You will see that the area is full with office buildings and condominiums. Ari now becomes a popular area for expatriate. Next to the station is La Villa, a three-story community mall offering stores, supermarket, restaurants, and beer garden.
From the station, you can walk to Soi Phahon Yothin 7 and Soi Ari. This area is a great place for a coffee lover especially if you love having a cup of coffee in a cute and trendy coffee café. There are also several restaurants, bars food stalls, and clothing stalls in the area.
Hope this information helps. Enjoy traveling Bangkok!