Available statistics information includes:
1. Top-level summary info: number of forums, topics and posts
2. Forum level suammry info: Top contributers (and how many posts each)
3. Admin level statistics (avaiable in SIte Settings): Per-user activity (posts, last visit day)
So, the answer for your question is: No, you do not have out-of-the-box way to see the #visits per forum.
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