Walton-on-the-Naze is very easy to reach, however you will be travelling:

Car:- approx 70 miles from London (A12, then short section along scenic local roads)
Train:- Walton has its own station. Regular connections from Colchester for the short journey to Walton.
Coach:- daily service from National Express)
Plane:- cheap Ryanair flights from many European cities to Stansted (approx 60 miles), then coach to Colchester, and regular local bus service to Walton. Or train (see above).
Ferry:- crossings from Hoek van Holland and Esbjerg, Denmark to Harwich with Stena Line or DFDS. From Harwich, it's a short drive to Walton or there is a local train or bus to Walton via Colchester. For parties of 1 or 2 a pick-up/drop-off service may be available from Harwich port at low cost. Please enquire.
Contact owner for more detailed transport info.