The phrase "goes riding" can be replaced by a number of synonyms depending on the context. One could use alternatives like "mount up," "hit the trail," "saddle up," "ride out," or "take a ride." These synonyms provide a more diverse and creative way to express the act of riding a horse, motorcycle, or bike. For example, one could say "I'm going to saddle up and hit the trail for a long ride." These different phrases can also lend themselves to different moods and styles, such as "mount up" can lend a more adventurous or daring connotation, while "take a ride" can have a more casual tone. The versatility of synonyms allows writers and speakers to add more nuance to their communication.