Was there formal training? Do you have receipts? Much of this will get down to reasonableness and primary purpose of the trip upon audit.

Another thing to consider is magnitude of your business. A $5k trip might be an excessive business expense on $10k annual receipts from massage therapy. It may seem more reasonable if you take in say $25k + in receipts regularly.

This is probably a bit of a stretch. I would have enrolled in a seminar or the like while away. Also important is the following tax language

* If a taxpayer travels to a destination and while at such destination engages in both business and personal activities, traveling expenses to and from such destination are deductible only if the trip is related primarily to the taxpayer's trade or business.

*Ordinary and necessary expenses incurred while traveling “away from home” in pursuit of a trade or business are deductible.

So unless you could prove that trip was primarily for professional development, it may be a stretch. Deducting the actual cost of the massage would be easily justifiable.

At the end of the day you should feel comfortable explaining the deduction to a stranger, because you may have to. Sounds like a killer trip though.