lovely position, nice room and staff
On arrival we asked for a villa rather than a tower room which the staff were able to do. 
The room was large and as you would expect with a Hilton. We had lovely outdoor space with a daybed which was a nice touch. The only negatives:
The walls a very thin and the neighbours had three teenagers shouting until late (past 11pm). We could also hear the low volume conversation. 
The wi-fi seemed to only work in the main communal areas!
The room safe was temperamental and needed a call out twice.
The grounds are great and the location perfect for sea world and the zoo. The facilities such as casual seating, fire pits and pools were all lovely although the pool was overrun with children as it was spring break. The kids pool is not big enough.
Breakfast was typical hilton (which i find very good although a little expensive). Although parking was free which was unusual in our 19 day trip.
The food in the onsite restaurant called Acqua was surprisingly good and good value too. The butternut squash and lobster soup was delicious!
All in all I would stay again if in San Diego.