Seems highly overrated. I went on the standard afternoon trip - not the dinner trip. Most of the trip was spent without narration. There was about 10 minutes at the beginning, then a bit more 45 minutes later. Then a bit while in Emerald Bay. Then nothing for the rest of the 2 1/2 hr trip. There was a movie about the history of the area that was shown on the way back. If you don't have a car, then this is probably the only way to see the lake - otherwise drive around it, stopping at the overlook at Emerald Bay. If you are bored & looking for something to do, it is a way to spend 2 1/2 hrs drinking & eating overpriced food, since you are not allowed to bring your own food or drink on the boat. We went during the week in mid-October, so the boat had only about 1/3 of its normal capacity of passengers. It would have been pretty crowded if full. Also, don't pay full price - there are discount coupons to be found everywhere.
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