No - once a year, or even every other year can be worthwhile. A great idea is to get an annual pass, and go 2 or 3, or even 4 times every two years, then have a year off. That is what i am planning to do - have 3 or 4 trips from one pass, every two years, then take a year off. The trouble is, with an annual pass, you really are tempted to go more.