Taking stock of my current physical condition and the length of time it's been taking me to acclimatize to the summer heat, I decided to take the conservative route and reverse the accidental full marathon registration of a few weeks ago and switch to the half. It means I'm going to enjoy my summer running a lot more. Which doesn't mean I'm abandoning the full distance forever - there's always Ottawa in the spring.
Sometimes you have to be realistic to get the best outcome.