Having to exchange the Viator voucher for a ticket before being able to board the Lake Alster cruise boat was somewhat frustrating and wasted valuable time when we were only in Hamburg for the day. The boat cruise was interesting but the first cruise departed at 10am. However, the first bus near the boat departure point didn't arrive until after 10am, so time was wasted waiting to exchange the voucher. Better co-ordination would be an improvement so that visitors could do the boat cruise at 10am if they chose.
Kay and Alister

Include a picture of the bus and boats. We were afraid of getting on the wrong bus. This would help eliminate that issue.
Bus tour was ok. Guide definitely gave more information in German than in English.
Lake cruise: Cruise was only in German and didn't really see anything you wouldn't see on the bus tour
Harbor cruise was great, very neat to see the ships up close

We found Hamburgh to be a lovely city,but the hop on hop off bus tour was an absolute disaster. The buses did not have an audio system and the only commentary we received was from the German driver. Initially he only spoke in German but after we spoke to him he threw in a few lines of English which because of his accent and tone of voice ,made him virtually impossible to understand. The commentary was so bad we did not even go on the Lake Alster tour,which also had no audio system. Both tours were a complete waste of money for us.

The river cruise was great. The bus tour was terrible. English speaking guests beware. This is not a German/English tour. It is 85% German and 15% English. The tour guide told long, apparently funny stories in German and did not repeat them in English. We got off midway. The lake tour was pretty.

The cruise and the bus tour were fantastic, staff were very friendly and very accommodating. The only issue was the local tourist information office were not aware of the viator and our original booking did not have the information related to the local tour operator on it. but we were finally directed to the correct tour company and the staff were very helpful.

It was very disappointing. In Hamburg we had to pay a cab 7 euro to get to the bus and 8 euro to get back Way to far. The distance from the bus to the boat on the lake was at lease a mile. I am so glal i didn't sign up for a hoponhopoff at all ten of our stops. The guide in Hamburg was very nice but they didn't give me all of the tickets I needed and almost didn't get to go on boat ride. We skipped the harbor tour. We were tired and frustrated. Sorry, I know some travelers love this alternative to high priced tours but for us it just didn't work..