That's a great little bike, just lock the front fork, get a better seat, and get these grips and you're set:
Why would you want to lock the front fork? I want to sell my bike (Terpfan??) and get one WITH forks so I can ride a bit smoother. 15 minutes on the C&O towpath and my head is pounding from the vibrations. Probably a result of my concussion history but in my case I'd like to dampen the vibrations on rough surfaces. My bike's fine on pavement or soft earth.