When is the best time to take a research trip?
In the development stage, so you can get ideas
Once you've finished the first draft, so you have a better idea of what you'll really need to know
Any time, it really doesn't matter as long as you take good notes
It varies with the individual writer/writing style
Other, which I will explain in comments
No idea, but if you're going somewhere awesome, can I come too?
Ooh, look at the shiny radio button!
I would especially value the input of fellow authors who have recently done this kind of thing -- did you wish you'd gone earlier in the process? Later? Any other words of wisdom to impart about research trips and what to do or not do when embarking on one?
X-posted from fangs_fur_fey.
ETA: dichroic asked where this faraway, exotic location might be -- for my purposes I'd be looking at parts of Kent, London, and the Cardigan Bay area of Wales.