When a challenge is being issued there are 2 possibilities:
1. IHG sincerely wants us to be able to achieve it, hence it will give you tasks that with high chance you can complete it, or
2. IHG purposely makes the challenge difficult (or almost impossible) to achieve.

I am based in Singapore, and ALL the resorts are in US. I know there are few resorts in Asia, but none of them are listed.

Regardless financial matter, it is very unlikely that I will travel all the way to US to just complete this task. Even if I am willing to pay, I may not have time to do it. It will take me at least 2 full days to fly to US and stay there for 3 nights. It just does not make much sense.

I was thinking to do some stays with IHG because of this thing. But looking at it now, probably I just just stick to my primary and secondary brands then.