One suggestion that I have is make a use for the Agility Arena Tickets. You can add an npc at the agility course and you trade the tickets to him for exp or other items. You can make the exp rates for the tickets something like:
1 ticket = 1,000 exp
10 tickets = 12,500 exp
50 tickets = 75,000 exp
100 tickets = 200,000 exp
etc...
And some items could be things like:
10 tickets = Hook
25 tickets = Onyx (uncut/cut)
50 tickets = H'ween mask (any color)
100 tickets = Santa hat