Marc,
I agree with all that Anne said.
I probably would add the Hotel Intercontinental (use to be the Regent) for a drink in their bar. A beautiful, relaxing setting of the harbor, boats and the Island side.
When we did our Seabourn trip, we took a taxi from the hotel to the ship which was as Anne said, tricky. If you taxi, perhaps your hotel conceirge can give directions. That is what ours did.
While we were in Hong Kong for our pre-cruise, the Mariner was in port. As we are Radisson fans too, besides Seabourn, we met some passengers with in the Harbor Shopping terminal. They went straight from the ship into the shopping center.
In our earlier trips to Hong Kong we also visited Stanley Island. You can go by bus. However, I don't know how it would be today. We have not returned in our last two visits to Hong Kong.
The Star Ferry makes it so easy to go from one side to the other side. Enjoy your trip.