Welcome to planDisney, Lawrence!
Three days at The Happiest Place on Earth sounds amazing! It's been nearly a year since my last
Disneyland Resort visit and I'm starting to feel "homesick." There's such a charm to
Disneyland Park! It's probably my favorite Disney Park to visit (and that's coming from a Walt Disney World specialist).
Lawrence, if you decide to purchase a
3-Day Ticket without the
Park Hopper, you won't be able to upgrade one of those days to include the Park Hopper. If you decide to upgrade, the Park Hopper will be applied to each of the three days (even if you only use it for one day). Your best bet is to make two transactions by purchasing a 2-Day/1-Park Per Day Ticket and then purchasing a 1-Day Park Hopper Ticket. You'll then be able to hop between Disneyland Park and
Disney California Adventure Park on one of your days. However, before you do that, it might be worth doing a bit of research to see which option is most cost-effective. You see, it might actually save you money to purchase a 3-Day Park Hopper Ticket instead of making two separate transactions.
I hope that's helpful, Lawrence! Have a fantastic time. Thanks for letting me help plan your great, big, beautiful tomorrow.
Mike