My travel in 2021 has all been rent-a-car free trips. New York, DC, Denver, and even FLL has been my frequent trips.

HNL: I would caution against reliance on Public Transit at Honolulu Airport. The Bus, which operates bus service into Honolulu, has a major baggage size restrictions. You are restricted to one baggage, no larger than inflight rollerboard. In 2022, Honolulu airport will have a new rail service that will connect the airport to Kapolei (Westward) but for Eastward: City center and Waikiki won't have service until 2025. Best hired option, in my opinion is Speedishuttle. Fast, Spacious and reliable service into town. Once settled-in and without a baggage, The Bus provides reliable access to the entire island of oahu.

FLL: There is a free bus shuttle servicing Tri-rail station which you can to connect to nearby cities, including Miami. One bus route of Broward County bus also service the airport, with connection option for North and South of airport. FLL isn't really my recommended public transit cities however.

DEN: The University of Colorado Rail Line is a convenient service to Downtown area with connecting service to other areas. Price is steep as it requires you to buy a 1 day pass at $10.50 but you can use the rail/bus all day. Highly recommend it.

MSY: Two different bus options: Jefferson Transit has reliable local bus service every 20-30 minutes into New Orleans. RTA bus is infrequent, but if you happen to spot a departure, highly recommend its express service.

LAX: Depends on where you are going. There is frequent free shuttle to the LAX Bus Center for bus service connection to Santa Monica (Big Blue Bus)/Culver City(Culver City Bus)/Various Los Angeles areas(Los Angles Metros)/Torrance Transit. There is also a free shuttle bus to Aviation/LAX station for the C-Line/(formerly Green) of the Los Angeles Metro Rail.

Washington IAD: Multiple options here. Bus 5A Metrobus to DC (Rosslyn station and L'Enfant Metro Rail stations), or Fairfax Connector Bus (#983 toward Wiehle Reston Metro Station and connect to Silverline Metrorail), or take the Silverline Express Bus($$) and connect to Silverline Metrorail also at Wiehle Reston Metro Station) Silverline is projected to be extended to the new Dulles Airport station in February 2022.

Washington DCA: Yellow or Blue Line of Metrorail.

Baltimore BWI: MARC Train to Baltimore Penn or Washington DC Union Station, or B30 weekday bus to Greenbelt Station for Greenline Metro Rail or Yellow Line Metro Rail

SAN: San Diego Airport is served by Bus 992 operated by Metropolitan Transit System with convenient connection to the Lightrail, Amtrak and Coaster Rail Service. Tho technically, I've also walked to these nearby stations following a scenic path. It's a long hike, but still doable with a backpack.

LGA: M60 Bus to Manhattan, or Q70 Bus to Roosevelt Station. I've only done M60.

I have tips for EWR too, but Southwest doesn't fly there anymore....

Jiburi