While on the Princess lines cruise to the Panama Canal I took there Scarlet Macaw Sanctuary tour. When I got on the bus the only seat left was one in the back over t he rear wheel. Being 6 foot two there was no room for my legs and the A/C was not working in the back. After riding over an hour with my knees up to my chin I needed help walking. Getting back on the bus for the return trip I tried to set in a different seat and the people on the bus would not go for it. So I had to ride back to the ship for another hour with my knees up to my chin again. When we arrived back at the ship I could not walk and thought I was having a stroke so went to the hospital on the ship and was told it was heat exhaustion The hospital does not take insurance so I had to pay over $700. I told the tour people on the ship about it and they just said,"I'm Sorry" So I'm stuck with a bad back and out over $700. So be sure and check your seat on the bus and that the A/C is working. Jack Hessler