First, to refresh your memory, here is the location as it appears in the movie, as the fictional "Reggie's Ice Cream".
The shop is in actuality called the Julian Cafe & Bakery and it is located at 2112 Main Street in Julian, California. Here is a look at the bakery as it appears today, thanks to the incredible power of Google Maps.
Click here to take a virtual tour around the area!
Interesting to note, the interior of Reggie's Ice Cream shop, as seen in a deleted scene on the DVD, was filmed at an actual ice cream shop, Fosselman's Ice Cream on Main Street in Alhambra, California. Click on that link to take a virtual tour of that area. Unfortunately Google's powers are only so strong, so you're gonna have to actually travel to Alhambra if you want to step inside and grab some ice cream!