I hired a taxi to reach Haft Tappeh from Ahvaz, which also took me to Chogha Zanbil & ended in Shush.
Cost me USD 20.
Travellers could easily hire a taxi from Shush, which would be nearer to Haft Tappeh than hiring a taxi from Ahvaz.
In my case, what happened was I arrived in Ahvaz by the night bus from Shiraz.
Arrived in Ahvaz at about 7 am, instead of going straight to Shush, I hired a taxi from Ahvaz to Chogha Zanbil, Haft Tappeh & would end in Shush.
Chogha Zanbil & Haft Tappeh are almost on the way to reach Shush.
At least when I was in Shush, I didn't have to go out again but instead exploring Shush which is an ancient city in itself.
To most travellers, Haft Tappeh itself is a tourist trap !
The site is not well-preserved at all, just some mounds of where the ancient site would be.
For me I still wanted to reach here simply because I would like to see the countryside this side of Iran. I saw cornfields & some factories though.
I still captured them through my camera but not to many of you, I suppose.
Unique Suggestions: You can skip Haft Tappeh if you want.
Fun Alternatives: There's a museum here if you are interested. I didn't go in because the sun was hot even at 12 pm; I just couldn't wait to reach Shush where I could take shower & lie down on a soft bed.
We can go up the mounds if we want. No entrance fees whatsoever.
Just be careful as there are holes here & there.
Also, there would be some workers doing some works there & they might not like you climbing up the mounds as it would probably interupting their work.
Better ask permission first.