We did the majority of our swimming at the pool each day. For the most part, we were the only people in it while we were there.
We had prepped the girls for vacation by taking swimming lessons for 4 weeks at the gym. They did great but still weren't independent swimmers. While at Wings on Wednsday we bought them some floating inner tubes, and they really liked using those. The water was 3 1/2 feet deep in the shallow end, so they couldn't touch and be above water yet.
We also had some kickboards from Grandma Goodman that we used to "practice our swim lessons."