The teens claimed CBP targeted them because they hadn’t booked hotels for their entire stay in Hawaii.
“They found it suspicious that we hadn’t fully booked our accommodations for the entire five weeks in Hawaii,” Pohl said. “We wanted to travel spontaneously. Just like we had done in Thailand and New Zealand.”
In addition, don’t say anything that suggests you will work, even if unpaid. Don’t mention volunteering, helping a friend, doing remote work, etc. The rules are quite specific about what visas allow and do not allow, and many border people are just there to catch a paycheck - they will absolutely err on the side of denial. It is not a fair game, and you will not be given a fair chance to explain yourself.