Marshall is only 16 miles south of Jefferson. It was one of the biggest and wealthiest cities in the state when Texas seceded from the Union in 1861. There are many historic homes and B&B's and well know for Marshall Pottery which is worth a visit. (see my Marshall page).
Caddo Lake State Park is west of Jefferson in Harrison County, consists of 483.85 acres along Cypress Bayou, which runs into Caddo Lake. The park was acquired in 1933 and was opened in 1934. You can take lake and Bayou tours from Uncertain. This, I thoroughly recommend, it was the best cruise I have taken. It was private and the scenery was awesome. (see my Caddo Lake Page).