Heck, Circus Circus was so fashionable it was the setting for a James Bond flick. (Diamonds are Forever in 1971, with Sean Connery as Bond.)
The theme park opened in 1993 as Grand Slam Canyon, during the 1990s building boom when Las Vegas fancied itself a family-friendly theme park destination, before casino owners came to their senses and realized that kids can't gamble. Renamed Adventuredome in 1998, the indoor park is the last major remaining development from Vegas' theme park era.
While Circus Circus no longer retains the theme design coherence it once had, and can't match newer Vegas developments for grandeur, there is a lot of history here for themed entertainment fans.
I saw the High Roller, which looked to me like it could be opening at any time. I thought it might be done, and actually went online to check. No dice, as they say in Vegas... ;^)
For those who haven't heard, the High Roller is another Orlando Eye/Singapore Flyer/London Eye-type observation wheel. At 550 feet tall, it'll be the tallest of the bunch when it opens.
Treasure Island, Luxor, NYNY, MGM were all going after a different group than the old school gamblers. These new maga resorts were geared toward families.
MGM had a theme park, the Luxor had a Nile river that flowed through the casino, Treasure Island had the (original) pirate show outside.
Did anyone else go to the MGM theme park? I spent plenty of summer afternoons there, haha.