It could very well be that we will be in Ennis around that time. We have to be back in North Idaho by about the 15th for a wedding.
As far as things we will do...fly fishing is #1 on DH's list. We will also be trying to trace some of his family history (his great-grandfather was living in the area in the 1870s). The other spot we had hoped to see is the Lewis and Clark Caverns State Park, which is only about an hour from Ennis.
The Ennis RV Park is probably our first choice. One year we were looking at coming up that way and checked out a place right on the river. We could stay there with our dog, but he was not allowed to go in the water. Try doing that with a lab!