Greg I did not buy ride tickets and now you ask that question I am questioning that myself. I believe you pay the entrance fee and THEN buy the ride tickets just cant swear to that. I have a picture of all the costs on Kens camera I have to look at the lap top.

HOWEVER, the rides are not much and unless you are a BIG ride lover dont know that it would be worth it. If you have ever been to Disneyland which offers such incredible rides and then compare that to a local State Fair, Tivoli is the local state fair type rides may just a little better. Actually it is a cross between a State Fair and perhaps 6 flags type park. What makes Tivoli nice is the grounds and restaurants.

AS to the VAT refund they come on the ship and you can just do all that on board at the end of the trip. Just keep the paperwork.