Cities, towns and villages
The county is situated just north of London. The area is quite suburban in character and has the third highest population density for a non-metropolitan county after Surrey and Berkshire which are similiarly suburban in nature. The Hertfordshire district of Hertsmere has the highest percentage of Jewish residents (11% but much larger in certain towns such as Radlett) of any english district outside London.
The native Hertfordshire dialect (which to the untutored ear has a distinct west-country tinge) is virtually extinct, supplanted in the post-WW2 years by "estuary English", a hybrid of various London accents and received pronunciation. This is because, in the post-WW2 years, more than 1 million people were moved from bomb-ravaged London to New Towns and expanded towns in the surrounding counties - a good many to Hertfordshire, meaning that accents in most of the Home Counties are now indistinguishable. English speakers (whether first or second-tongue) will have comparatively little difficulty understanding it.
Hertfordshire is to the north of London and is easily accessible by train. Trains from London St Pancras International will take you to St Albans and Harpenden, from London King's Cross to Welwyn Garden City and Stevenage and trains from London Euston will stop in Watford and Hemel Hempstead.
Any of the major roads heading north out of London pass through Hertfordshire, principally the M1 (for west Herts), A1/A1(M) (for central Herts) and M11 (for east and north Herts). Watford and St Albans are about a 20 minute drive from Heathrow Airport around the M25 (clockwise), with the rest of the country easily reachable in another 10 minutes or so (all, of course, subject to congestion!).
London 3rd airport, Stansted, connects to many international destinations and to the train services offering connections to London or Cambridge.
Rail links, as mentioned, run north-south but there are no services running east-west across the county so the alternative is bus/coach travel or rental cars. There are many taxi services within the area. You can call them to get your destination. The very popular service is running in the UK, like UBER and click4cab. If you are in Hamersmith you can call Hammersmith Taxi and if you are in Colchester then you can call Colchester Taxis, if you are in Hertfordshire then you can call Ware Taxis. They are affordable services.
There is plenty to do and see in Hertfordshire, but on highly popular activity is watching sports. Local team Watford play at Vicarage Road in the town itself and will be in the Championship for the 2014/15 football league season. Saracens rugby team also play their home matches at Vicarage Road, whilst occasionally using Twickenham stadium for their larger matches.
Around Hertfordshire, there are plenty of other activities to undertake. Local business Supercar Experiences is an expert in providing a luxury car rental service to those who are interested in testing their driving abilities in some of the world's supercars. Whilst this is an activity for adults, there is plenty to keep the kids entertained as well.
The  riverside garden centre in hertford has a fantastic restaurant by the river side which serves a superb selection of meals to set the tastebuds racing. From a magnificent traditional English breakfast to light lunches, hot and cold snacks, excellent main meals to fresh cream teas.
Hertfordshire is the second safest county in the U.K. The chances of you being attacked/robbed at night are slim, and in the daytime basically none. The only crime you may encounter is at closing time in the larger areas (Watford, St. Albans, Hatfield and Stevenage) around clubs/pubs. Theft or interference with cars may occur, but only if left in the more unpleasant areas overnight.
Usual instructions apply, if a crime/emergency is in progress call 999 or 112 and ask for Police/Fire/Ambulance as needed. There are main police stations (generally open 9-5) in Watford, St.Albans, Hatfield and Stevenage and smaller ones in all the other towns.
Hospitals (with A+E) in Welwyn Garden City (QEII), Stevenage (Lister), St. Albans (St. Albans City) and Watford (Watford General).