Are both okay:
I been there a few times and had fun but it was a while back.
And
I been there a few times and it was fun but it was a while back
It should be "I've been" not "I been". Otherwise they are both OK, but I would advocate some punctuation: I've been there a few times and had fun, but it was a while back. I've been there a few times, and it was fun, but it was a while back.
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It should be "I've been" not "I been". Otherwise they are both OK, but I would advocate some punctuation:
I've been there a few times and had fun, but it was a while back.
I've been there a few times, and it was fun, but it was a while back.