It's just too much to give anything more specific - It would smell like summer, winter, spring, and fall at once, it would be snowy and rainy and sunny and cloudy and warm and cold and day and night and evening and morning, it would be the ocean and a pine forest... no, change that to
any forest, and prairie and mountains and rivers and whatever else I forgot to mention.
I just couldn't decide!

I know what
isn't going to be there - cities, or anything to do with them. And there's going to be a tinge of mint in it - for some reason I always assosiated athelas with mint.