Planning a short trip to RMNP in Colorado in a couple of weeks. Thinking about taking a half-day guided trip while we are there, and have been checking out the local guide services, and know the approximate costs, equipment, etc. Only thing I'm not sure about is the gratuity. What's customary for a half-day trip? Just don't want to look like a dimwit or a cheapskate when I'm there. Thanks.
CJ