Aqualand along the road towards Faro wasn't very busy last August (and we went at the second half of August) and it's bigger than slide and splash. You can get round waiting for some of the rides by renting a rubber ring for about 4 euros. I usually go once a year and we have a geat day out.
We always have a day out at Slide and Splash when we visit in August. Yes it is busy but our 3 children have never found it an issue and it's always on the wish list of things to do. They can't wait to go this year.
Yeah splash and slide its self is busy, but no you dont have to que long cause they get everyone down the rides quite quickly. bout a 5 minute wait MAX on some rides, others its just like a 1-2 min wait, we go every august!
My son went to Slide & Splash last week with a friend & on the best rides/shoots they were waiting for up to 10-15 minutes which he said was ok, except there was no shade whilst queueing & his friend got burnt, so remember lots & lots of sun cream.