Saskatchewan is literally the middle of nowhere, and that can make it a fun place to visit. It is about as far as you can get from any ocean, and it's southern landscape (the part of the province that is inhabited)is covered with a patchwork quilt of farmers' fields. In the early summer, the canola fields are in bright saffron flower and the view from the air is breathtaking.
The people of Saskatchewan are friendly, and the area has thriving Native Canadian communities. Try to attend one of many summer pow wows, if you get the chance. Farm stays also give one a sense of authentic rural life. If you want some more lively action, Regina and Saskatoon are startlingly cosmopolitan for their size, with more restaurants per capita than anywhere in North America, and you can catch some great blues, indi rock or country music at many of the pubs and clubs.
Above all, Saskatchewan is big sky country. If you're into storm watching this is the place for you. For a calmer, more zen experience, catch the fantastic display of the Northern Lights on many clear nights, or just drink in the stars without the light pollution of the densley populated areas of Central Canada and the West coast.
If you do want to cross the province on your way somewhere else, try the Yellowhead Route ( no. 16) through Saskatoon, and up to Edmonton. Take advantage of a pitstop in Saskatoon, and it will put to rest stories about how boring the province can be.