Nice, sounds like a great day! We didn't ride with my older son until he was ~1.5, he sat in a rear seat on my bike. He could do 20+ miles with no complaints, which was amazing since he hated being in the car. My younger son is ~7 months now, definitely seems ready to ride though we haven't tried yet. I'm so jealous that you got a free trailer! That is amazing. I am still on the lookout for a cheap 2-seater. The trailer I have now has no seats, so it is not great for fragile little kiddies ;)