Myself and my 10 yo daughter did a trip with Dan, mid April. It was a sunset tour and it was very very good. There was no one else on the river when we went, except the ferry.
Dan went out of his way to encourage questions and he answered everyone honestly and with much knowledge. He did not stop trying to find any sort of critter to see and succeeded.
His enthusiasm for the river hasn't waned after 20 years and he delights in his job.
An excellent tour, thoroughly enjoyable.