According to Merriam-Webster a vacation is a “respite or a time of respite from something”. Certainly vacations should be a time for new adventures or a quiet time allowing one to refresh.
All too often someone returns from vacation and has a long path back to productivity. They spend time telling others of their adventure or they visit co-workers to discuss the things they did while away.
This is typically interesting to engaged coworkers but should be limited to break or lunch periods.