Here is the post about this topic from the Yacht and Beach Club FAQ thread. If you would like to check out the info on the first page of this forum, you can click on the link in my signature.
Should I take the bus* from the Beach Club to the Magic Kingdom or go through EPCOT and use the monorail?
We always take the bus from BC to MK!
Bus is definitely quicker:
The ride is less than 15 minutes from BC to MK, then you just have to add in the wait. I think 15 minutes is the most I have ever waited for a bus, it is usually around 5 minutes.
Here is a very conservative estimate of the trip from BC-EP-mono-MK:
5 minute walk to International Gateway, bag check and entry at IG
walk though United Kingdom, Canada and Future World to EP front entrance, 25 min
wait for mono ?
mono from EP to TTC plus changeover to express monorail, 15 min
mono to MK, 5 min.
So a minimum 50 minutes, with a lot of walking, an extra bag check and switching monorails.
Please note: You need Park Hoppers and EPCOT must be open if you are doing this.
That being said, we often take the monorail back to the BC from MK. That way, we can enjoy a couple of attractions along the way, or get some takeout from Sunshine Seasons or one of the World Showcase restaurants on the way back to our room.
* even if you have a car on property during your trip, it probably makes sense to take the bus when you are traveling to MK. If you are driving, you will have to park at the TTC and take the monorail or ferry boat to the MK entrance. If you take a bus, you are delivered to the front entrance. A taxi cab is another option, but again, this will only bring you to the TTC, so you may want to have the cab leave you off at the Contemporary Resort and walk or take the monorail, or to one of the other monorail resorts.