Hi Rose,
The boat cruise is on Day 2. Here's the details:
A local guide is with the group for a morning sightseeing tour. The whole group will be together. The optional boat cruise is at lunch time where the group, if they don’t take the boat cruise have free time in the city until approx 15:30 when you all meet the coach and return to hotel.
Timings
09:00 - Depart Hotel for included Prague sightseeing (guided).
12:00-14:00 - Optional lunch cruise along the River Vltava
15:30- Transfer Back to Hotel
Dinner this evening at local restaurant
I hope that helps! 🙂
Thanks,
Vickie