I think this is best done as part of a package I did the half cruise, train and motor museum. A half cruise was long enough as it was ralaxing and you have the novelty value. The staff were very helpful and the boats was clean. On two of the bigger boats on days with less favourable weather there is a indoor seating area which is heated along with a place to buy hot drinks and snacks. On the lower deck there is a bar. I think half a cruise was long enough for me personaly but the older generation would probably enjoy the full lake. There is also a commentary telling you what was on the bank on the right hand side of the boat.
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