San Juan Hot Springs is a part of Orange County's history that dates back to the Acjachemen People who inhabited the area. Later on on history, it became a resort where tourists and locals would travel to enjoy the natural mineral hot spring pools. The current Ortega Highway is slightlt different than the original route through this area and now actually cuts right through the middle of what used to be the town which now has the old hot spring tubs on the North side of the highway and some remaining cottages on the South side that are still inhabited. While the springs are actually right by the fire station on Ortega Highway, getting there is the difficult part since OC Parks took over the area quite a while back which is actually great because otherwise they would be too easy to access and they wouldmost likely be vandalized and trashed. To get there now, you must enter through Caspers Wilderness Park and hike about 16 miles round-trip. The springs are not recommended to go in due to health concerns but they're still there and still hot, if you do decide to enter, of course it's at your own risk and definitely do not immerse your head for risk of an amoeba called naegleria fowleri which enters through your nasal passages and attaches onto your brain and will cause death within a few days, it can be found in any hot springs or warm water and cases of it are very rare but it's better to be safe than sorry. Other than that, this is a great place to visit and see a part of Orange County that not many other get to see.
To get here from Caspers Wilderness Park is up to you to find as there are a couple different routes you can take from inside Caspers, you will basically be venturing right towards the fire station on Ortega Highway so do some research before going and pick your trails to take, there is also a trail that mostly parallels Ortega Highway which you can take.