A day-tripper is a person who visits a tourist destination, tourist attraction, or visitor attraction from home and returns there on the same day - in other words this excursion does not involve a night away from home.
This makes the day trip a very popular form of recreation with families for whom the logistics and cost of such a night away from home can be prohibitive.
In Medieval days a destination for such days out would be religious (to a nearby shrine) or commercial, for example to a fair.
Later, in England, visits to stately homes by those who regarded themselves middle class became frequent and it was the tradition to reward the butler or housekeeper with a tip for providing access to their employers' home. As such homes were meant for show it is unlikely that the family would object, provided they were not in residence at the time.
The arrival of the railway excursion in the mid-nineteenth century saw the real advent of the day-tripper industry. They also travelled in their thousands by steamer to the many piers around the seaside resorts.
Cycling became a very popular day-tripper activity, especially amongst urban and suburban workers from tje mid-1880s onwards.
Coach trips and char-a-banc outings followed as the internal combustion engine became reliable enough to get the paying customers out and back again.
While all of the forgoing still exist for most people the modern day-tripper experience is by motor car. As a result a visitor attraction can not properly call itself such unless it provides a car park.