Tipping question

[cruiseplease]

We (family of 4) have scheduled a whale watching excursion next month in Juneau (Harv and Marv). I am trying to have everything prepared ahead of time and enough cash on hand to tip everyone. It is my understanding that there will be someone who drives us to/from the dock (2 people???) the boat operator and a naturalist on board. It is a small group, but not private. Is there anyone I am missing? Generally how much do people tip? TIA

[WeatherFun]

We booked a whale watching excursion from Havr and Marv as well. Our trip is next week. I have the same question. 

[Elaine5715]

We were on the Harv and Marv 6 person boat .  We tipped the Boat Captain $40 and driver $10