WestVilles Lagoon is Open Everyday. Entry fee is Only 2 euros per person.
If you Eat at WestVilles you can use the Pool for FREE. 

WestVilles Lagoon is a Large Swimming Pool with a number of Sun Loungers, Umbrellas, Picnic Tables and areas for Towels. We also have a Small shallow Childrens pool which then makes this location suitable for the whole family. Located around the Pool is a Sauna, Jacuzzi, Changing Facilities, Toilets, Pool Bar and a Bar thats a shaded seating area. Perfect place to relax, Drink, Eat, Game of Pool or watch the Sports on TV.