Even a small investment in bistro furniture could allow operators of parks and gardens to add some outdoor seating, and build on the already substantial market for overseas visitors to Britain's green spaces.
According to figures from tourism agency VisitBritain, overseas visitors spend £7.8 billion on days out in Britain's parks and gardens each year - making them more popular than castles, museums, art galleries and historic houses.
Interestingly, the only activities that rank as more popular include shopping, going to pubs, and eating out.
Parks and gardens could cash in on each of these activities, by adding a well-stocked gift shop, a licensed bar or a cafe to serve visitors, with outdoor bistro furniture and a terrace to make the most of any sunny days.
The popular perception that only more mature people like to spend time in parks is contradicted by the data too, as for every 1.4 million people aged 55-64 who visit Britain's parks and gardens from overseas, there are around 2.4 million aged 25-34, and 2.1 million aged 35-44.
Younger people are particularly likely to add a day in a park or garden to their visit to Britain, with 41% of under-35s doing so, compared with 33% of over-35s.
A further interesting result from the research is the effect the London 2012 Olympic Games has had on international tourists' desire to see parts of the UK other than the capital.
In total, 75% of all people surveyed by VisitBritain in locations all over the world said the Olympics had made them more likely to want to visit locations outside of London during their next trip to the UK.
Almost as many - 70% of respondents in total - said the coverage of the Olympics had left them with the impression that the UK has "lovely countryside".
"Post-Games perceptions of Britain have shifted for the better," says VisitBritain chief executive Sandie Dawe, "and time spent in any of our glorious parks is something to be cherished - especially when the sun is out."
As many parks already have tea shops and cafes for visitors, the right addition of bistro furniture could extend the number of customers you can serve, with outdoor terraces on which international tourists can soak up the sun.