You can get to Greenwich easily by train or bus, or by taking a boat down the Thames. For the best experience, go by river, weather permitting, and return by rail. Not only will you and your children enjoy the boat ride, but you'll get to see the London Eye, St Paul's Cathedral, Shakespeare's Globe, The Tower of London and Tower Bridge. You'll be traveling the Thames -- the historic water highway from London -- as royalty have traveled to Greenwich for hundreds of years. Also, arriving by river puts you in the perfect position to begin exploring Greenwich.
By water, the trip is about 30-60 minutes each way. You can get onboard sightseeing cruises near the London Eye at Waterloo, Westminster and Tower piers.
London River Services (LRS) London River Services (LRS) provides safe and reliable river transportation for both commuter and leisure journeys. Check the Transport for London website for river maps and the latest timetable.
For City Cruises, boats basically leave every 40 minutes starting at 10am and ending at 5.30pm or 6pm depending on the location. Tickets are available online.
If you would prefer a guided tour to get the most of your time in Greenwich do contact Greenwich Royal Tours in advance. They have regular half day and full day tours with more options being added all the time.
If the climb up the hill in Greenwich Park to the Royal Observatory is not enough for you and want a really exciting climb why not consider climbing over The O2 at Up at The O2? And if you head over to The O2, why not try the London cable car/Emirates Air Line too?