The Lake Loop trail is suitable for horses, as are many of the main roads throughout the park. The stables within Roman Nose State Park organize guided tours on horseback, as well as evening hayrides.
Although there is no swimming allowed in either Lake Watonga or Lake Boecher, you can hire paddle boats, canoes, and kayaks if you'd like to explore the park from the water. This can often be the best way to spot some of the park's more elusive wildlife.
If you do feel the need to cool off, head to the swimming pool at the southern end of Lake Boecher, which is open throughout the summer.
Older children might want to join their parents for a round of golf on the 18-hole course. You can also rent equipment and just have a practice on the putting green.