For only admissions, you'll want to use the Daily Admissions report. This report can be filtered by specific date ranges or relative dates (ie Last year, This year, This week). The report also breaks down attendance by price type. You can find this report using these steps:
  1. Go to Sales 
  2. Under Reports, select Daily Admission

If you want to report on total number of visitors for all programs, the Event Attendance report will provide this information. You can filter on specific programs and dates with this report.  You can find this report by using these steps: 
  1. Go to Sales
  2. Under Reports select Event Attendance