Can anyone suggest me for best trekking areas?

It really depends on your experience level and what kind of scenery you're looking for, but here are a few amazing hiking destinations I'd personally recommend:
1. <a rel='nofollow' href="/https://www.greattibettour.com"> Everest Base Camp </a> One of the most iconic treks in the world
Incredible Himalayan views
Moderate to challenging (altitude is the main difficulty)
2.Annapurna Circuit
More diverse landscapes than EBC
Villages, forests, and high mountain passes
Great if you want a longer, immersive trek
3. Tiger Leaping Gorge One of the deepest gorges in the world
Dramatic cliffs and relatively accessible
Good option if you don't want extreme altitude trekking

If you are looking for Nepal then here are top 10 best trekking route in Nepal
https://www.amigotrekking.com/blog/top-10-best-trekking-nepal/

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I think you should contact AAI Edutourz. They are one of the best tour operators. They provide affordable tour packages to their clients. Please visit: https://www.aaiedutourz.com/customize-tour.html

The Fitzroy Trek – Patagonia, Argentina
If you are exploring Patagonia and you already have plans to hike the Torres del Pain then it is certainly worthwhile to add the Fitzroy Trek to your Argentina itinerary while you are in the area. The route leads you from El Chalt?n to Laguna El?ctrica. Though the Torres del Paine is the most popular route in the region, the Fitzroy trek is certainly a worthy contender for being the most beautiful.

With jagged peaks and unique rock formations, it is easy to fall in love with the scenery here. Fortunately the trail is also a relatively straightforward route. You do not ascend to altitudes which are too high or dizzying, the trails are clearly marked and the terrain is flat and constant. As such, the Fitzroy Trek is suitable even for less experienced hikers and is a nice alternative if you are intimidated by the Torres del Paine.

Distance: 26km, 1 Day
Level of Difficulty: 2/10
Best Time to Go: Year round
How to: Join this 9-day Patagonia trekking trip to experience the Fitzoy Trek and several other trails in Patagonia.
best treks in the world - fitzroyFlickr image by roman cors

A group of my friends is planning for Thailand trip and they have divided their trip between Phuket and Bali. Recently they already booked a Phuket Boat from "boatlagooncruises". Mountain Trekking was not getting their mind so I am going to suggest them about it as they like an adventure like it.