DP has just purchased a bike, and I think I'm going to join him. DS is not far off 3. He has a balance bike which he's very happy with. We went on a UK break last year and got bikes for the day, and DS was very upset to be put in a trailer, rather than ride his daddy's very large bike 
My question is - those who ride bikes, how do you manage with a toddler?
I don't think DS would enjoy being in a trailer, and the same applies to a seat on the back of the bike. I've been looking at the WeeBuddy which looks great, but I am really worried about him letting go and not understanding that he needs to hold on to be safe. The same thoughts go to a tow bar onto his own bike.
Has anybody found and (safe) contraptions that can secure a child on to a bike, or do we just need to wait until he's a little older and understands he needs to hold off?
We'll be cycling on canal paths so I'm pretty anxious about the risk of falling.
I should add, DS has a speech delay and with that, a delay in understanding, too. It's difficult to explain to him as he struggled to comprehend what we are saying, so telling him to hold on won't really help at this point.