Well you can get your chips just about anywhere downtown....lots of variety stores. As for your excursions. The walk through history, the Valley Wine Vineyard. Or there are a lot of museums right in the harbour.....I have toured them myself and they are quite good. The Titanic display is quite interesting. The is a glass blowing shop with beautiful crystal, just up the street a bit is the Keith's brewery that you can tour..it is very popular. everything can be found in a 1 to 2 block stretch up and down the street. You can go on Theodore the tug boat , whale watching, lobster dinner and habour cruise.
As for booking through carnival. I would just take a cab everything you want to book is there except for the vineyard. Just tell the driver you want to go to warf by the courthouse..(right next door). You will find live entertainers, cute shops and CHIPS.
Have fun. Anymore questions let me know.
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Eastern Caribbean - Costa 11/01/07