One time in HNL I was returning my car at HNL and heading to their tiny inter-island terminal. The shuttle was empty but the driver said he had to take the normal route and go to the main terminal first before dropping off at the inter-island terminal. Puzzled because there wasn't anyone else on the shuttle. I was running late and got off the shuttle because I saw a cab dropping someone off for pickup of their car. Rep saw me get off the shuttle and asked what happened...said he'd drive me to the terminal personally. $20 tip for a 3 minute ride and I didn't miss my flight (even though the next one was leaving 1.5 hours later)^