I can help with your older child, this is the exact age our DD was her first time, and she LOVED it... She will be 6 next month, and she still remembers just about every detail of her first time....WE have been twice since, and she is just itching to get back...
As for your younger one, I have heard great great reviews about Flounders..I have been inside with my cousin when she brought her daughter (nearly 2) and her daughter loved it there. They have so many playtoys, ranging from infant to older toddler...
The only downside when we cruised with them, is that at the mickey pool, the children who are not trained, must stay in the ear of the pool...SO her daughter pulled quite a few fits...This is a must regulation, I understand, and am completely in agreement with it..I just think that with two young ones, it may be difficult to have one in one area, and the other one unable...
But, it would not stop be, I would go with bells on if I were you..
