20 miles, Multiple days
Big Sur has many great destinations, but Sykes Hot Springs is definitely near the top of the list for anyone who has been there. It is roughly 9-10 miles to the Skyes campground, and limited climbing after the first 2 hours (which can be steep at times, and tiring in the direct sun). It is possible to treat it as a day hike, but it is recommended to take some time for the hike, as there are rolling green hills, several waterfalls, and wildflowers throughout the trail, none of which should be missed.
The hot springs is about 8 feet across and a couple of feet deep--about the size for 4 adults, and it stays around 100 degrees depending on rain.
Start by parking at the Ventana Wilderness area ranger station and heading towards the back parking lot.
Parking is now $5/day and campfires are not allowed during summer months, even with a fire permit (this may change depending on the season).
The ranger station wants you to have a campfire permit even for stove and lantern use.