You don’t need a ticket to walk to Three Sisters Islands.

No. The park itself is free to enter. You just walk onto Goat Island, then out to the islands. No admission, no pass required.

The catch is parking. If you drive to Goat Island, you’ll pay whatever the lot charges (and it’s not cheap). But the walk itself is free.

So if you’re staying nearby or can walk or shuttle in, you’re golden. The only thing stopping you is your own laziness—or the parking fee.