To register and (pay if applicable) for an Activity or Tour, please click Add to Cart. Items are listed alphabetically.Note: If you do not see an “Add to Cart” button, there are five possible reasons. 1) – Registration has not begun yet. 2) – You have not added an Annual or Semester Membership level to your cart. 3) – You are not logged in (check for Welcome First Name in the top left-hand corner of the screen). 4) Registration deadline has passed. 5) Tour or Activity has been canceled or postponed.