Just got back from Lighthouse. My brief opinion is below.
Flys are still an issue that needs to be solved. They don't appear to be as bad as the day one videos but they are still an issue.
The menu is a little lacking. I did not go hungry, but there was nothing there that really wowed me.
The 1/2 mile pier is kind of a non issue at is really the only walking you have to do on the island. The golf carts for those that need them work well. I do however think they need to at minimum mark off a cart only lane on the pier. I saw half a dozen completely oblivious people (kids and adults) walk right in front of moving carts in a span of about 15 minutes.
The logistics of the island are very well done at least at the adult only end, but the rest of the island appears to be set up the same way. The bar and restaurants are 100' from the beach. You can go from water to bar in 120 seconds. The walking paths are great but a little more directional signage would be incredibly helpful.
The beach is better that Castaway. The sand is finer and the chairs are closer to the water. I was a little worried about snorkeling since there is no dedicated lagoon like at Castaway. Those fears were unfounded. The island is surrounded by a reef. The sand is fairly devoid of sea life, but the reef is loaded with it.
The "look" of the island is just going to take time for the planted vegetation to take and fill in