Well, that depends. Seats vary from tour to tour and person to person.
Most tours we offer are rider level (1) leisure or (2) recreational. These tours will be on hybrid touring bikes, which have bigger, more comfortable seats.
If you're still concerned, we'd recommend:
1. Training up to your tour - nothing makes cycling more comfortable than being prepared.
2. Purchasing padded bike shorts, a gel seat cover, or both!