We are traveling from Paris to Leiden in May on a Sunday, after our RS 21 Day Best of Europe tour. We will be taking the Thalys from Paris to Amsterdam, then a train from there to Leiden. We haven't bought our Thalys tickets yet (still a couple of days too early), but will probably book the train that arrives in Amsterdam at 15:42; our second choice would be the following train, which arrives at 17:42.
There seem to be many trains from Amsterdam to Leiden, leaving from Amsterdam Centraal. Many are direct, while others require a change at Schipol. Is it necessary to book ahead for this leg of the journey? I'm reluctant to commit this early, but don't particularly want to spend all that afternoon and evening hoping for a free spot on a train.
Thanks for your help.