I took my very first narrowboat holiday about 5years ago on the Monmouth & Brecon canal with Brecon Park Boats.In the 20 or so miles from thier wharf to Brecon you will experience most features of canals including locks,electical opperated lift bridges + hand opperated bridges,tunnel and aquaduct.It is one of the most scenic canals in the country but beware of the bug I caught the bug on that weeks holiday and it got into blood.The only way I found to control the "bug" was to take early retirement and buy my own boat We now take 7 or 8wk. cruises to keep it under control and are enjoying some of the most enjoyable days of are lives.It all started with a week on the Mon. & Bec. so give it a go you will love it.