I recommend Combat Hornet from
here (4th from the top). It combines few other mods for stock FSX Hornet but comes as a separate package. For me the best improvement is better HUD which is conformal to the outside world (i.e. horizon bar stays on the horizon and the velocity vector shows the correct flight path as read against the pitch ladder and the outside world). The rest of the features are listed in the readme
along with radio frequencies or TACAN channels for ILSNEW FEATURES
*************
Head-up Display
**************
1. Accurate F/A-18 HUD symbology
2. Transparent HUD glass
3. Blue/green color
4. Ground Proximity Warning System
5. Barometric/radar altitude
6. Caged mode
Carrier ILS/TCN Navigation
***********************
1. Default Acceleration carrier: 111.00 MHz or TACAN channel 47X
2. Javier's Nimitz carrier: 112.00 MHz or TACAN channel 57X
3. Clemenceau carrier: 113.00 MHz or TACAN channel 77X
HUD Radar modes
****************
1. Radar Gun Acquisition (GACQ) sub-mode (20 degrees forward looking within 5 nm)
2. Radar Single Target Track (STT) sub-mode (TD Box, range and closure rate)
A/A Master Mode
***************
1. Air-to-air guns mode enabled with two gunsights:
1.1 Funnel Mode
1.2 Gun Director Mode (Gun Reticule with "SHOOT" Cue)
2. Realistic Gun:
2.1 Precise ballistic trajectory of a 20mm PGU-28/B round fired by M61A1 Vulcan
2.2 HIGH/LOW rate of fire (6,000/4,000 rpm)
2.3 Feedback if target was hit
Additional Gauges
***************
1. Carrier Landing Gauge (Shift+7)
2. PLAT camera crosshairs (Shift+8)
3. In-Flight Refueling Gauge (Shift+9)
Flight Model
************
The flight model is unchanged from the Acceleration Hornet except for manually controlled flaps for more realistic landing speeds and arrestor wire tension reduced for smoother landings.