I'd like to recommend some possible updates to hotel offerings:

Show Tables: In a number of casinos, their theatre has a number of tables for patrons down around where the orchestra pit would be, with the chairs (usually 4) all generally facing the stage. Could bring a few dining points with it, too, although I've usually only had a beverage there.

Stage blocks: Would it be possible to get a 2x2 or even 3x3 block? Filling in nothing but 1x1 gets a bit tedious, especially for the larger concert stages.

Gym amenities: Exercise bicycles, all-in-one weight machines, yoga mats. All things we see even in hotel fitness centers, and would add a little more variety than just the treadmill, weight bench, and dumbbells.

Room Service: For hotels with a certain minimum number of floors (Normally I'd say 3, but I'm going to suggest a minimum of 5 to make going to 4-star more lucrative), add a dining bonus in the form of room service.

Boutiques and Gift Shops: In the casinos near me, and also a number of the Wynn properties in Vegas, there are small shopping areas, whether it's a retail boutique, food court, or gift shop. Perhaps commission-style revenue could be used for this?