Interior Design

Both the fields are good but architecture includes interior designing. Architecture is a professional course whereas interior designing is a certificate course.
If you don't want to study for 5-6 years then go for interior designing otherwise architecture is the best.
Now it depends on your choice. Whatever decision you will take just enquire properly and take a rational decision.
All the best and have a great career ahead.
Please feel free to revert.

It depends on your interest, but B.Arch has a wide scope.

Hotel management is a good option.

Yes, you can and there are many colleges for the same. I am listing few of the best colleges there:
Sir JJ School of Art
Rachna Sansad School of Design
Pearl Academy
Raffles Design International
Aditya College Of Design Studios and many more.

If you are passionate about designing field, then opting interior designing is not a bad choice. But, if you are opting the field just out of curiosity, then I must tell you that interior designing demands a lot of detailing and concentration along with the hard work. It will take 4 to 5 years to get a high paying job after the course.

INIFD, Pune is the best college to pursue the interior designing course.

Dear Lakshmi,
The fees for Diploma in interior design differs from institute to institute. Please find below the list of institutes along with other details. For scholarship, check with the college you wish to get admission in:
https://design.shiksha.com/diploma-interior-design-courses-in-india-categorypage-13-70-412-0-0-1-1-2-none-1-0