The postcard from Panama

The postcard from Mum and Dad's epic adventure finally arrived today.
Dad has always been fascinated by the feat of engineering of the Panama Canal so as a massive surprise for his 70th Birthday Mum booked them on cruise from San Francisco down to South America in October.
They had an amazing time and both loved the whole experience and particularly liked Columbia.
Dad had better put his thinking cap on for Mum's 70th!