The planning...

We booked the following flights and trains for the places, as well as tickets for various attractions have been listed below:

Flights and trains:

London to Paris:
Eurostar - book online in advance, print the tickets and keep with you to show at boarding time.
Booking website: ://www.eurostar.com/us-en
Review: Comfortable, nice train

Paris to Barcelona:
British Airways operated by Vueling Airways, booked via Expedia in advance.
Booking website: www.expedia.com
Review: On time, comfortable

Barcelona to Nice:
Easy Jet, booked via Expedia in advance
Booking website: www.expedia.com
Review: On time, comfortable, book check-in baggage online, higher fees on the airport

Nice to Rome:
Easy Jet, booked via Expedia in advance
Booking website: www.expedia.com
Review: On time, comfortable, book check-in baggage online, higher fees on the airport

Rome to Florence, Florence to Pisa and back, Florence to Venice and Venice to Zurich

Trenitalia

Booking website: www.trenitalia.com

Review: Booking starts 4 months in advance for best prices, prices increase as date of travel gets closer, comfortable train, take your own food and drink, as on board prices are prohibitive.

Zurich to Lucerne, Lucerne to Interlaken and Interlaken to Geneva:

SBB - booked one day ahead of time in person

Booked at the train station in Zurich. Very helpful representatives. 

Comfortable, and tickets can be booked for the day, not exact time, so can be flexible.

Attractions booked ahead of time: 

Stonehenge, England
Website to book for the Stonehenge:
http://www.english-heritage.org.uk/visit/places/stonehenge/prices-and-opening-times
(we booked the same morning we were going and saved about an hour in line.)

Bateaux Mouches Seine river tour - Paris 
Website to book for Bateaux Mouches: http://www.bateaux-mouches.fr/
Adults: 13.5 Euros, and children 6 Euros.
(booked  couple of months, no need to print, they found the reservation by last name, picked up actual tickets at the counter)

Louvre - Paris:

Website to book for the Louvre: http://www.louvre.fr/en/hours-admission

 (booked couple of months ahead - print and take with you - definitely saves you time)

La Sagrada Familia - Barcelona (booked couple of months ahead, print and take with you, saves you time)
Website to book for La Sagrada Familia http://www.sagradafamilia.org/en/tickets/

Vatican Museum - Rome : 
Website to book for the Vatican Museum: www.museivaticani.va
Adults: 16 Euros, and children 8 Euros + total booking fee of 16 Euros.
(booked couple of month ahead - long line around the block for people with no tickets, saved us about 2-3 hours wait time)


Colosseum and Forum - Rome (booked couple of months ahead, print confirmation and then go to the office at the Pantheon entrance and get actual tickets, saves you about an hour).
Website to book for the Colosseum and the Forum: http://www.coopculture.it/en/colosseo-e-shop.cfm

Other trips booked last minute that could be done earlier:

London Eye: (would have saved us about an hour in line at the time)

Train trip to Pisa (we weren't sure when we were going and it was a local train from Florence, so decided to buy a day ahead)

Train trip to Pompeii (we booked 2 days ahead of time, but earlier booking would have got us a faster train at a lower price)

Day 28: Lucerne to Interlaken

The last destination on our trip - Interlaken. :).

We were looking forward to the pretty little town surrounded by lakes. We took the train from Lucerne and reached Interlaken Ost station in 1 hour. On the way, we saw the lakeside town of Brienz which looked like a good stop for next time. :)

From the Interlaken Ost station, you can either walk the one mile to the city center or take the bus #21. Our hotel - Hotel Blume was right in the center of the small town.

Map of Interlaken area

Referring to the map, the distance from the Interlaken Ost station to the "i" (tourist office) was 1 mile.

We took the bus (CHF 3.5 per person for a one-way ride), which dropped you near the Tourist office and checked into our hotel. Would recommend this hotel - we liked the breakfast that was included, and the service was really nice.
From the hotel, we walked to the Tourist office on the corner and inquired about the paragliding activity, as wherever you saw, you saw paragliders floating above you and landing in the green open space near the center of town. We booked ourselves a paragliding session for the next day. From there we walked through the small downtown area - watch stores, souvenirs, and Schuh's - the fondue and pastry restaurant. We also passed the Casino, where there is a clock made on the grass and we were surprised to see - a statue of Yash Chopra! (Indian movie director). We walked about a mile to the Harder Klum starting point and a little by the river and then came back to the hotel.

The next day, we were up early for our paragliding experience. We were met by the driver near the tourist office and they took us up to the jump point by bus. The ride was about half hour. At the top of the hill, they help you put on the gear - and then one by one, you run off the hill and off you are - floating on top of Interlaken and get a fantastic view of the green hills, lakes and little houses here and there. It was a wonderful experience!

Paragliding over Interlaken

After paragliding, we came back to our hotel, and prepared to check out.

Wish we had more days in Interlaken to include a few hikes in the Swiss Alps...

We took the 1pm train to Bern and then another train connection on to Geneva, as our flight back to London was that same evening.