Amusements listed in the ad included a Fun House, a Shooting Gallery, Bingo, Dart Game, Balloon Bust, and a Fish Pond.
Crystal Beach Park was well known for the popular Big Bands that performed there. Upcoming bands listed in the 1947 ad include Frankie Masters, Stan Kenton (one of my father's favorites), Carmen Cavallaro and Vaughn Monroe.
For a really terrific history of Crystal Beach Park that includes many wonderful photos and postcards, be sure to visit this link on Rich Tarrant's Vermilion Views website. Crystal Beach Park has been a regular topic on the Vermilion Views website over the years, so if you type in "Crystal Beach" in the search box at the bottom of the page, it will bring up the links of additional posts that mention it.
Drew Penfield has a nice history of Crystal Beach Park on the first page of the Vermilion section of his Lake Shore Rail Maps website, including some great photos.