The marquee in a field idea is lovely. We went to one, (yes, I know I'm beginning to sound like a professional wedding crasher!), in a farmer's field. The farm belonged to our friends, and the groom was their son.
It took a lot to prepare the field, difficult to get it flat enough for a good floor, and marquees can be quite a price.
They hired portable loos, had a restaurant from Manchester to prepare paella on site, and had an ice-cream van arrive with music going. It was another brilliant do.
My brother in law had a country church wedding with the country traditions, and a horse and trap which took them up the hill to a marquee in the farmers field too. Gorgeous.