To Get to the Kampot Port, you need to get to Kampot first.

You need to find your own way to and from the Port. Maybe use PassApp, a free App here in Cambodia. About $5+ between the Port and downtown Kampot. Otherwise, they’ll take $5 or more to get you right to your destination.

When leaving the Kampot Port, there are large Tuk Tuks at the departure gate. $5 to downtown (about 15 minutes), or more to go further, right to your destination.

Directions from downtown Kampot to the Kampot Tourist Port.
From in town, go to the Kampot River. Turn Left (towards the ocean). By road, drive 15 minutes along the River. You’re There!

And after you get to Kampot, unless you want to live here, you need to get out of town.

By boat, by train, by car, by bus, by Tuk Tuk. That’s pretty much it.

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These are your options

Bus, from anywhere in Cambodia. Most buses travel between Kampot and Phnom Penh.

From Phnom Penh, you can go anywhere in Cambodia. There are also buses to and from SihanoukVille, Cambodia. From Kep, not really any public transport. Except, the Port has a bus leaving Kep one hour before the boat sails for the Islands, right to the Port, and will also take you back to Kep when you get back to Kampot…. Must have a ticket in advance.

Train
Between SihanoukVille, Phnom Penh, Kep, and other places. The Train stops right in Kampot, about 20 minutes from the Port. Not really sure where in Kep. If you’re coming to visit Kampot first, you can get a Tuk Tuk (small taxi) to downtown for about $1 and up to 3 people. About 5 minutes.

Car
You can rent a car with driver almost anywhere in Cambodia. A private car to or from Phnom Penh cost about $50. They’ll pick you up from your hotel and take you right to Kampot or the Port.

Tuk Tuk
A Tuk Tuk between Kep and Kampot cost about $10 and takes about 30 minutes.

Much more on the Kampot-Cambodia.com website.