You will most likely have well over enough points if you reach the end. My score when finishing was 51,000. You get 5,000 for finishing and extra points for each red mailbox you threw a tape in.
It can be a little tricky at the end. If you know what to do it becomes a lot easier. A car will come out and throw things at you, you can either jump or move quickly. After you gotta go in front of their car to dodge getting hit then press B to jump over and quickly move left. After there is one more street to reach Jessica. It seems a lot easier to stay on the curb to the left. If you see the statepuff marshmallow man then quickly move to the middle. Go in the middle at the end to get some good money too. To see it being done check out my video below.
My achievement walkthrough: