Beautiful days (especially those which do not contain sunburn!)
Neighbors who run unsecured wireless networks
Ice Cream makers
Homemade ice cream!
Jobs which show appreciation for work above and beyond the call of duty and give out "rewards" (which mine did, and they let me pick, so I picked an ice-cream maker!) (which should have been tried out weeks ago, but got it's inaugural spin tonight)
Finding fun stuff at thrift stores
Days which are enough fun that when totally exhausted at the end of them I say "good!!!" instead of only "Ouch"