Planning a trip to Canada

In September of this year for 2 weeks

I'm looking for a place with beautiful nature and looking forward to doing simple hiking and walking some trails.

My first choice was Banf national park but the hotels are extremely expensive. staying in Conmore and driving an hour back and forth isn't an option

So what's is a good second option? Is there another park or area worth going that affordable?

I am coming from the US if it helps in anything