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The Beach

Answer :  Diane

Let's analyze the hints:
1. Luciano's wife is building a sand castle with Richelle's husband.
2. Catherine is playing Frisbee with her husband Daniel.
3. Roland and Diane are reading a book.
4. Ronald and Peggy are drinking lemonade.
5. Diane is not Ronald's wife.

From hint 2, we know that Catherine's husband is Daniel.
Therefore, Luciano's wife cannot be Catherine, leaving Luciano's wife to be Richelle.

Now, from hint 1, Luciano's wife (Richelle) is building a sand castle with Richelle's husband.
This implies that Richelle's husband is Luciano.

So far:
- Luciano's wife is Richelle.
- Luciano's husband is Richelle's husband.

Now, from hint 3, Roland and Diane are reading a book.
Since Diane is not Ronald's wife (hint 5), Diane must be Roland's wife.

So far:
- Luciano's wife is Richelle.
- Luciano is Richelle's husband.
- Roland's wife is Diane.

Now, from hint 4, Ronald and Peggy are drinking lemonade.
Since Diane is Roland's wife and Diane is not Ronald's wife (hint 5), Peggy must be Ronald's wife.

So far:
- Luciano's wife is Richelle.
- Luciano is Richelle's husband.
- Roland's wife is Diane.
- Ronald's wife is Peggy.

The remaining couple is Catherine and Daniel.
Since Catherine is playing Frisbee with her husband Daniel (hint 2), Catherine's husband is Daniel.

So, Roland's wife is Diane.