Day-Trip to London

Hey Guys,
Next Thursday is a bank Holiday and I am goin to London. These are my plans for the first day:

I will arrive at Waterloo at 9:00 p.m.
The first sight I am planning to visit is ST. Pauls Cathredal. I take the Northern line, get off at the 4rd Station. Change to Central line western Bound and get of at Bank station. From there it's a 20 minutes walk to get to the St Pauls Cathedal. I think I will spend 3 hours there.
After visiting ST Pauls Cathredal I will go back to Bank and on to Monument Station. Then I will take District line east Bound, get off at the first Staton Tower Hill. Then I will visit the London Bridge.
Finally I will visit the Madame Tussauds. I take the Bakerloo line nothern Bound,get off at the 5th Station Baker street. Then I go 15 minutes to Madame Tussauds. After the long visit I will go back to the Waterloo Station. 

I hope it will be a nice adventure
xxx Vanessa