Wow SW,now I'm jealous, and feeling ripped off, ;) 1,000 each from Kelowna - Ensenachos for a week in paradise? That is AMAZING at this time of year, I'm paying twice that much and thought it was a deal over last year! Ah well, good for you, you will love the place. As for what to wear, it's as casual or as dressy really as you want to make it, although you cannot wear your swimsuit into the main lobby and restaurant without a good cover up. A lot of people dress up for the evening but there are always those who don't. YOu don't need a lot of cash, except for the tipping and a taxi if you use one, and we usually take some Canadian cash and change it at the hotel, no problem. For tours and anything extra like the spa treatments or car, you can use a credit card. Just don't get american express traveller's cheques, they won't take any bank things that are american. For gifts, I often take some over the counter meds, tylenol, advil, etc., some toys for the kids, I hear baseball caps that used to be popular are now getting overdone!!! Last year I picked up some of those multi-gadget tools and the guys really liked those. I'm sure there's a list of stuff somewhere!!!
When did you end up getting your trip, you are probably arriving as we leave! Have a wonderful time.