I know what you mean. I hate to "waste" relatively pain free days by not taking full advantage of them to do all the things I want to do. And yet I know all of my early warning signs of a flare and hate to tempt fate by going overboard with activity. Sometimes it's just best to take it easy. Sometimes the activity is worth the risk of feeling worse later. I trust my gut instinct on decisions like these, and it sounds like that's what you did today too.