Sure, you can join some expensive private pool, suffer through the frigid temps of local waterways, or swim illegally in our water supply, but why deal with the financial, physical, or ethical pain? Baltimore has some 40 public pools, including wading pools, indoor and outdoor facilities, and some serious Olympic-size ones. Patterson and Druid Hill parks' pools are particularly noteworthy, as is the recently renovated and festively decorated pool in Roosevelt Park in Hampden, even if it is a bit hard to find. Best of all, swimming in city pools is crazy cheap--$1-$1.50 per visit or $10-$25 for a season pass. And you know cooling off during the sweltering heat and humidity of a Baltimore summer is well worth that price.