According to the Activities board on the Swept Away section of this site the Catamaran goes out Monday, Tuesday and Friday. Hopefully that will hit one of the days you're there. You are seated at the non reservation restaurants e.g. Palms.
As far as umbrella huts go there areanumberof them on the beach but there isalso plenty of Palm trees to go around as well.
It's such a nice treat to be seated at the restaurants. They greet you with such a nice smile, walk you to your table, pull out your chair and place the napkin in your lap. Talk about feeling like a queen and king. The first time we ever went to CSA it was our first time at an All Inclusive and it just felt wrong to get up and walk away from the table without leaving money. You will love CSA!