Will be playing golf in Hua Hin then motor directly to Swampy airport for flight to Hong Kong. But want to send golf bag back to Chiang Mai. No golf in HK for me.

What options available to ship golf bag from HH to CM?

Use the Post Office. If they can move motorcycles, a Golf bag woukd be no problem.

Efficient and reasonable.Cost will be dependent on what you insure it for.

http://www.thailandpost.com/index.php?page=rate_result&country_code=TH&weight=15000

But the PO is not expensive.

If your flying back into swampy , you could leave it there and collect on your return perhaps

Send it on a bus is another option.

I would prefer the post office.

Send it as "LOGISPOST".

http://www.thailandpost.com/index.php?page=article_detail&topic_id=64&group_id=47&addon=product

You turn it in at any post office and can send it to any other post office for pickup (no home delivery), 250 Baht for such lightweight item.

Home delivery is available for extra cost (and not to any destination), LOGISPOST PLUS.

An alternative to Thai Post might be KERRY LOGISTICS with offices all over Thailand. They have recently expanded their delivery services. Google them for the office nearest where you will be shipping from. I believe their size limitations are far more liberal than Thai Post

They can pick-up as well as deliver.