I live in Gazcue. I uise the Hotel Melia pool. They do not have day passes as a general rule. The cost of membership has gone up to $10,000 to join and then $2000 a month. However, if you and your family are just coming for a day, PM me and you can come as my guest... then we can talk to the SPA management about how much you want to use the pool.
The other pool in the neighborhood is the Jaragua, which, when I checked it out was much more expensive, and IMHO not as good a pool for lap swimming. since it is an odd shape. The Melia is on the mezzenine level and always has a nice breeze.. and and the grill makes a great hamburger .. ok. pricey.. but a treat once a month.
Usually I opt for a cappucino after my laps.
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