Dating

Going too fast?

So I let this guy three weeks ago, after the first date we became a couple. It's only the beginning but we already planned several dates and a two day trip in two weeks from now.
I know it's the famous "honeymoon time" where everything seems perfect but we really feel so natural around each other. It only seemed natural to plan all these trips as if we've been married for years.
Even though I'm enjoying my time with him, I know that I shouldn't jump eyes closed in this relationship.
What do you think I should do? Just go with the flow or try to put some boundaries even if things look good for now?
Going too fast?
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