In his later years, Park built a significant career as one of the world's best golf course architects, with a worldwide business.

The Musselburgh Links course in the family's home town was one of the main centres of golf at the time, and was on the rota for The Open Championship from 1873 to 1891.

In 1892 it was removed from the rota in favor of Muirfield, a new course which became the home of the Honourable Company of Edinburgh Golfers.

Park entered this profession, while winding down his competitive play, in his mid-30s, just as golf was beginning an enormous increase in popularity, in both the British Isles and especially North America.

His services were much in demand, and he became one of the first people, along with fellow Scot Donald Ross, to become a full-time golf course architect.

Park's first well-known design was the Old Course of the Sunningdale Golf Club near London, just at the turn of the 20th century.

This club's brilliant success on heathland property, which earlier had been thought unsuitable for golf, brought him worldwide fame.

Donald Steel described it as "challenging enough to keep good players at full stretch without diminishing the enjoyment of the rank and file".

Bellefonte Country Club in Ashland, Kentucky (Home of the longest continuously played AJGA event).

Philmont Country Club in Huntingdon Valley, Pennsylvania, which hosted a Nike Tour event.

He also laid out the original six holes [8] of The Sadaquada Club (1895) in Whitestown, NY, which were later improved to a full nine by Horace Rawlins, the first winner of the U.S. Open.

He also made a stop in State College, Pennsylvania in 1922 laying out plans for the schools White Course which reopened in 1926.