Best experience at any price
This place is amazing for visitors! From free concerts at night to the world's largest chromed kidney bean, to the free family oriented events daily to the most outrageous wading pool with 50 foot tall sprinklers to the world class sculptures to the location by Lake Michigan and the Art Institute to EVERYTHING! You can spend the day here, not go anywhere else, and still not run out of things to do. The Great Lawn was great for relaxing, reading and sleeping when there wasn't a concert. Watching kids of all ages marvel at the fountain with 50 foot tall towers of light and video could take up a good chunk of the day. And did I mention that 4 story chromed kidney bean?
Buckingham Fountain is also in close walking distance. Multiple bus lines fun next to the park, plus free trolleys in the summer to take you to the Magnificent Mile, Navy Pier, the Field Museum, Shedd Aquarium, and the rest of downtown.
Bring a picnic, stop by a nearby restaurant or store for a snack, or pick up a meal at one of the vendors, but enjoy a relaxing meal under the sun if you go.