The cache is located next to a moderate-to-high traffic intersection on the St Margaret's Bay Rd. I wouldn't advise parking too close to GZ (due to traffic). Rather, parking is available at one of many nearby local businesses, or also at the trail head for the Long Lake park. Note that parking at Long Lake will involve crossing St Margaret's Bay Rd, while parking at one of the businesses will involve crossing the 103 offramp -- either way, there's a crossing.
I had my kids with me when I scouted out the cache location (ages 6 and 3), so the journey is somewhat suitable for young kids as well.
Congrats to WiFi902 for being the FTF!