In addition to the routes well-discussed here( NEX+walk, taxi; Limo Bus; Keisei Skyliner +Yamanote line), there are two other simple routes between these two hotels and NRT using subway.
Route 1 <Narita Express + Marunouchi line>
Directions:
1. Take Narita Express from NRT to Tokyo Station. It stops on the fifth basement. Escalator up to B1.
2. Change trains to Marunouchi line subway. Take a train on track #1. It is on B2 level. Ride takes 20 min.
3. Get off at Nishi Shinjuku Station.
4. Walk 2 minutes, go out C8 Exit to Hilton,
or walk 4 minutes, go out A7 Exit to Hyatt Regency.
pros:
1. Unlike the route using NEX to Sinjuku, you don't have to start walking from the world busiest station, Shinjuku. Next to the exit of the subway station Nishi Shinjuku, there are some big maps of near-by areas. So you can easily find the directions to the hotels.
2. All walks are underground. No umbrella is needed.
cons:
1. Subway may be crowded.
Route 2< Skyliner + Oedo line>
Directions:
1. Take Keisei Skyliner from NRT to Keisei Ueno Terminal (Don't get off at Nippori)
2. Walk 500 meters underground to Ueno Okachimachi Station on Toei Oedo subway line.
3. Take a train for Tocho-mae Station.
4. After 19 minutes' ride, get off at Tocho-mae Station, take A7 Exit,
5. Walk 400 meters (3 minutes),go out C8 Exit to Hilton,
or walk 1 minute, go out A7 Exit to Hyatt Regency.
pros:
1. Skyliner ride is to its terminal. This means you can take a nap
. The conductor will wake you up if you are doing so when you arrive at the terminal.
2. Unlike the route using NEX to Sinjuku, you don't have to start walking from the world busiest station, Shinjuku. Next to the exit of the subway station Tocho-mae, there are some big maps of near-by areas. So you can easily find the directions to the hotels.
3. All walks are underground. No umbrella is needed.
cons:
1. One has to walk 500 meters between Keisei Ueno Station and subway Ueno Okachimachi Station. (But it is well marked as lots of people transfer between the two stations)
2. Subway may be crowded.