One of the great pleasures of a trip to Aswan is taking a felucca out onto the Nile.
One of the least enjoyable aspects of a visit to Aswan is having to go on a felucca on the River Nile. 
mnli hypothesis: One of the least enjoyable aspects of a visit to Aswan is having to go on a felucca on the River Nile.  premise: One of the great pleasures of a trip to Aswan is taking a felucca out onto the Nile.