Amsterdam has masses of pools but all the indoor ones close in the summer to force you to swim outdoors:

Floraparkbad (outdoor)
Sneeuwbalweg 5
(020) 6368121

Flevoparkbad(outdoor)
Zeeburgerdijk 630
020- 692 5030

Mirandabad (indoor and outdoor, plus a flume)
De Mirandalaan 9
020-546 4444

Zuiderbad (indoor)
Hobbemastraat 26
020-678 1390

Bijlmerbad
Bijlmerpark 76

Brediusbad (outdoor)
Spaarndammerdijk 306
020-6846984

Sloterparkbad (indoor and outdoor, flumes)
President Allendelaan 3
020 - 506 3 506

Sportfondsenbad Oost (indoor, a place to learn to swim)
Fronemanstraat 3
020 6650 811

Sportfondsenbad West (indoor, a place to learn to swim)
Cornelis Dirkszstraat 11c
020 - 618 89 11