Wiktionary
day-tripper
n. Someone who takes a day trip
Wikipedia
Day-tripper
A day-tripper is a person who visits a tourist destination or visitor attraction from his/her home and returns home on the same day.
Such an excursion does not involve a night away from home such as experienced on a holiday. The day trip or daycation is a popular form of recreation and leisure for families who care for young children or people who are too frail to travel easily or who own pets, or for whom the logistics or cost of a night away from home may be prohibitive.
Usage examples of "day-tripper".
These were the super-rich of the Inner System, day-trippers who were using Trudy Melfords link to Mars not because of need, but to make a statement.