My fiancée and I visited Mira Vista on our road trip from California to Austin, Texas last fall. They were right in the middle of building a bunch of condominium units on the property, so there were dirt roads, construction equipment and construction workers during the weekdays.
That said, the little hotel part of the resort is cute and well-kept. Their pool area is quite nice, along with a large covered area with lounge chairs and barbecues, etc. It reminded me of a Caribbean beach hut resort-style relaxation/party area.
The most notable thing there, though, was the restaurant. The general manager hired an executive chef to try and make the restaurant a destination in itself, and I think they're on the right track. The food was excellent—it tasted like it should cost $30+/plate, but was entirely reasonable at $8-15/plate, if I remember correctly. And you get to dine in the nude, so that's always a plus.
Overall, I think Mira Vista will be much nicer when they're done with their construction project, but it's still a neat place to visit, especially if it's warm enough to go into the pool. Oh, they also have a game room with ping pong—awesome! :)