For seat pain, I'm one to point the nose of the seat at the top of the handlebars. In some cases with a bit of a tilt down. That means more active holding yourself on the seat. But, it may help.

There is a class of bikes called "Flat Bar Road Bikes", some of which are very nice.

Also, if you have an REI nearby, perhaps have a gander at some of their "adventure" bikes. You can get smooth tires.