This is a great excursion to see beautiful caverns with rock formations millions of years old. It is less than two miles off of Interstate 5 (Exit 695). We were worried because we had a 27-foot Class C RV. The roads to get there are a bit scary, but just take your time, as it is worth it. There is space in the parking lot for RV parking, though there are no designated RV parking spots.
You can do reservations ahead of time, but just note that the time that you sign up for is not a guarantee. If you arrive there and the ferry has left or is full, they will just have you take the next one. There is a lot of walking, and the site itself has a lot of steps (over 250 steps). Also, they do not allow you to carry anything larger than a small purse, so no backpacks, big bags, etc. You can bring cameras, so take all the pictures you want.
Once you register, it is about a quarter mile walk to the ferry, then a five minute ferry ride to the island. Once you are on the island, you will have a five minute shuttle ride to the holding area. The holding area is like a little museum with some artifacts and pictures of the history of the area. There are bathrooms at both the site where you arrive on the ferry and at the holding area. It is about a 30 minute walking tour inside the caverns. Round trip with tour is about two hours. It is slightly on the cool side inside the caverns, so for those who like to stay warm, a light jacket will do fine (but with that much walking, you will warm up). Another thing, make sure the little ones go to the bathroom before they enter the caverns, as there is no place to go to the bathroom.
The tour itself was great. The caverns are beautiful and you will enjoy it, unless you have difficulty walking (as said, over 250 steps from entrance to exit).
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