You can very easily go to the Panama Canal at the Miraflores Locks on a multi-hour layover at Panama City's Tocumen International Airport.

I just booked myself a five city, four country award for 15,000 United miles + $73. Let's back up a little bit before I explain my current award.
My 2013 Euro Hopper
Two years ago, I flew a Seven City, Seven Flight, Six Country Award in Europe for 12,500 United miles plus taxes.

The United Explorer Card now comes with 50,000 bonus miles after $3,000 in purchases made with your card in the first three months the account is open. Plus you get 5,000 bonus miles for adding an authorized user on the application. (The AU's card comes to you, and you don't have to input a social security number or make a purchase with the card to get the 5k extra miles.)

This limited time offer ends June 2, 2015.

This is the tenth post in a monthlong series that started here. Each post will take about two minutes to read and may include an action item that takes the reader another two minutes to complete. I am writing this for an audience of people who know nothing about frequent flyer miles, and my goal is that by the end, you know enough to fly for free anywhere you want to go.
Where We Are and Where We’re Going
We’re in the section on redeeming miles.

Look in your email inbox for the subject "Your chance to win the trip of a lifetime."

The email explains that American Airlines wants to familiarize everyone with the AAdvantage program, so it is offering 1,000 bonus miles

Look in your email inbox for the subject "Your chance to win the trip of a lifetime."

The email explains that American Airlines wants to familiarize everyone with the AAdvantage program, so it is offering 1,000 bonus miles

What’s so special about Etihad’s route from New York (JFK) to Abu Dhabi? It’s the only American route of the fanciest commercial cabin in the world, with the westbound flight clocking in at just under 15 hours.

The First Class suite with a couch/bed and seat costs 90,000 American Airlines miles between the United States and the Middle East/India if Etihad releases award space.

What’s so special about Etihad’s route from New York (JFK) to Abu Dhabi? It’s the only American route of the fanciest commercial cabin in the world, with the westbound flight clocking in at just under 15 hours.

The First Class suite with a couch/bed and seat costs 90,000 American Airlines miles between the United States and the Middle East/India if Etihad releases award space.

Currently ThankYou Points earned on the Citi Prestige® Card and Citi ThankYou® Premier Card can be transferred to 12 types of airline miles or Hilton points.

Cathay Pacific Asia Miles
EVA Air Infinity MileageLands
Etihad Guest
Garuda Indonesia Frequent Flyer
Qatar Privilege Club
Singapore Airlines KrisFlyer
Thai Airways Royal Orchard Plus
Air France/KLM Flying Blue
Malaysia Airlines Enrich
Virgin Atlantic Flying Club
Qantas miles

Right now both the Citi Prestige® Card and Citi ThankYou® Premier Card are offering huge sign up bonuses after spending $4,000 in the first three months.

Currently ThankYou Points earned on the Citi Prestige® Card and Citi ThankYou® Premier Card can be transferred to 12 types of airline miles or Hilton points.

Cathay Pacific Asia Miles
EVA Air Infinity MileageLands
Etihad Guest
Garuda Indonesia Frequent Flyer
Qatar Privilege Club
Singapore Airlines KrisFlyer
Thai Airways Royal Orchard Plus
Air France/KLM Flying Blue
Malaysia Airlines Enrich
Virgin Atlantic Flying Club
Qantas miles

Right now both the Citi Prestige® Card and Citi ThankYou® Premier Card are offering huge sign up bonuses after spending $4,000 in the first three months.