I'm not as near to retirement as I'd like to be (still have 20 more years!) but I absolutely love this reminder to enjoy the journey. I, like you, can't think of anything I'll miss about working, but it's on us to learn to enjoy the journey and not just the destination.
I also absolutely LOVE that you did this challenge with your daughter. I cannot think of a better bonding experience. Way to go, Dad! You've inspired me to ask my kids if any of them would be willing to take on a challenge like this with me lol.