Please give my any advice on the following itinerary.
Arriving in Venice on April 11th -
April 12th -
10:30 St. Mark's Basilica
13:00 Shop, wander
15:00 Ascend Campanile.
17:00 Grand Canal
20:00 Dinner.
April 13th -
10:00 Doge's palace with secret itinerary
12:00 Walk from St. Mark's Square to Frari Church
13:00 Tour Frari Church.
14:00 Tour Scuola San Rocco for Tintoretto.
14:30 Lunch.
16:00 Tour Ca' Rezzonico.
17:00 Explore Dorsoduro
18:00 Cruise Grand Canal.
21:00 Savor a drink
April 14th is a travel day
April 15th - First full day in Florence
10:00 Taste of italy Walking tour (4 hours)
14:30 Medici Chapels
15:00 Church of Santa Maria Novella
15:30 Wander and snack
17:00 Climb the Campanile.
18:00 Renaissance Walk through heart of old town.
20:00 Dinner on or near Piazza della Signoria.
April 16th -
8:30 Accademia (David)
10:00 Museum of San Marco (Fra Angelico).
10:30 Galileo Science Museum.
12:00 Lunch, free to wander and shop.
13:45 Uffizi Gallery
16:30 - 17:30 Via del Monte Alle monks singing vesper
19:00 San Miniato al Monte Sunset at Piazzale Michelangelo (dinner picnic).
April 17th -
9:00 Duomo Museum
11:00 Santa Croce Church
13:00 Lunch.
14:00 Pitti Palace, Boboli and Bardini Gardens.
18:00 Oltrarno Walk.
20:00 Dinner in Oltrarno.
April 18th is a travel day
April 19th -
Do the "Caesar Shuffle" from the Colosseum to the Forum, Mamertine Prison, Trajan's Forum, Capitol Hill, and Pantheon
April 20th - Second full day in Rome
Vatican City — St. Peter's Basilica, dome climb, and Vatican Museum.
Dinner and walk from Steps to Fountain
April 21st -
Borghese Gallery
April 22nd Rome - nothing planned
April 23rd Travel to Santorini
April 24th-25th relax on Santorini
April 26th - Travel to Athens
April 27-29 Athens - Nothing planned.