Hi Jax
Vietnam is on my to do list too. My only concern about it I've been told there are a lorra lorra steps around all the temples. That puts me off as I had a knee injury last year and I don't want it to flair up again.
Our friends went a few years ago and he is an absolute fitness fanatic and very slim... but even he couldn't fit down the tunnels (shoulders too wide) so no hope for me then.
Cheers Geri