In my version of heaven you can swim everywhere in perfect temperature water. You don' t have to -- you can also walk, fly, teleport or whatever else you can imagine. But there are swimming roads to everywhere, just in case you want to swim there. They are neither too hot nor too cold and there are convenient ledges and rocks to rest on or use as steps for getting in or out. It's completely soothing and as easy or as hard as you want it to be. You can be floated effortlessly to your destination on a warm buoyant current of water or you can pull yourself upstream through a current just cool enough to keep you from overheating. Whatever you want, it's there.
Well I found a streaming webcam that seems to show a small corner of my heaven. It looks so lovely. The place it shows is a geothermal spa in Iceland called the Bláa lónið (link to spa's web page) aka the Blue Lagoon (link to Wikipedia entry).
Click here to view a streaming-webcam view of heaven.
And click here to check out pictures of the Blue Lagoon in Google images.