Oranjestad is a good tourist port with many options for exploration and activities. The beaches are clean with soft sand and offer typical beach amenities such as restrooms, chairs, refreshments, water sports, etc. There are casinos and shopping areas all within easy walking distance of the port. The island also features two nice golf courses.
Docking in Willemstad, this island also features shopping and casinos in easy walking distance from the port. It is a picturesque town, nice for touring on foot or by horse drawn carriage. Outside of the city I suggest you take a tour rather than rent your own car because driving yourself can be confusing and slightly risky. The beaches are nice here but the water is generally loaded with rocks and coral so aquasox or water sandals are needed. There are a couple of nice golf courses featuring their own resort that you can enjoy.
If you like New Orleans, you will probably like Cartagena. The architecture is very similar and the walled old town has a lot of interesting buildings within its environs. What is not so enjoyable is the innumerable street vendors hawking their wares and they are all over you constantly. I didn't get to see the "new" area with its skyscrapers and modern buildings.
This was the wealthiest of all of the cities in Western South America that we visited. It was typical of all large cities in that there was plenty of commerce and activities although everything was quite a distance from the port so a tour here is necessary. There are quite a few historical sites like La Popa Monastery, Huaca Pucllana and of course no stop would be complete without purchasing some Peruvian jewelry and trying a Pisco sour.