A las vegas seven days trip itinerary including budget and activities for a group of 5 friends.

A las vegas 7-day trip from Bangalore to Las Vegas for a group of 5 people.
A trip begins with packing. Check the weather forecast for all your travel destinations and plan your clothes accordingly.
Your bag itinerary must have common medicines, and also, if you are allergic, be specific about packing what you need.
Always keep a pair of cloth in cabin baggage if check-in baggage has a delay - you can stay a day or two with the clothes packed in cabin baggage. 
Make sure to have some snacks in the cabin baggage 
Make sure to keep travel documents copy set in all luggage you carry. Make sure to have some local currency as well ready before you travel.
Make sure all hotels, Airport pickup and drop are booked, and you keep a copy of those documents.
Flight charges from Bangalore to LasVegas cost between 130k to 180k per person depending on the carrier and seat preference( Economy or first class)
Now that you have done pre checklist, now below are the things to do in Las Vegas
In Las Vegas - Visit the Bellagio fountain at night.
Check out High Roller Observation Wheel
Visit the Neon Museum
Walk at night in the las vegas strip
If you are interested in casinos, tons of casinos start from the Airport. In the las vegas strip, you can visit MGM Grand, The Venetian, etc., for Casinos. 
Visit the Shark Reef Aquarium at Mandalay Bay
Visit the Red Rock Canyon National Conservation Area
You can hire a rental car - The cost per day is approx. 70 to 100 USD per person if divided by all five people
Visit the Hoover Dam in a car
Next, you can plan for Zion National Park and prepare for hiking trails. 
Next move to Grand Canyon 
Stay in Page, Arizona 
From there, you can visit GC National Park's South rim and north rim
Don't miss Horseshoe Bend and Grand Canyon Lower and Upper Antelope Canyon tours
So these places can be covered in LasVegas for three days and Page, Arizona for three days
You can head back to LasVegas and Shopping for one day and catch the next flight back to your hometown
Expenses per person per day, 1000 USD to 1500 USD, depending on whether you are in a budget hotel. Except for Food. Food costs up to 50 to 100 USD per day.