My friends and I travelled to Jeju during christmas time last year. it was a great trip. Not only is the island beautiful and full of wonderful experiences; but travelling with great people is always a bonus. To top it off our tour was well put together. We had enough space to enjoy our visit as friends together, talking about snowy shores and hidden lava caves. But we also were able to connect with our tour guide and learn a lot from him. It was wonderful having someone who knew the backroads (one way dirt roads and orange groves etc.) and could speak fluent Korean. It kept us from having to butcher the language. I recommend it. You go on your tour, have a great time, then come back and write about your experience too!