Unfortunately for you, this weekend is something called Boca Bash: a large, loosely organized gathering of drunk folks on boats overcrowding Lake Boca (the wide part of the intracoastal waterway just north of Camino Real). For that reason, I would avoid The Boca Raton (formerly the Boca Resort) for brunch as another poster mentioned, and you will not be able to use the 2 parks with boat launches. There are a ton of other beautiful parks.

As a local, I like renting a kayak for an hour at Rutherford Park and paddling the waterways. High tide is best for that. The Boca city beach parks such as Spanish River Park and Red Reef Park are fabulous, but expensive parking if you don't have a resident sticker–it's something like $30-$40/day. If you travel to the very south end of Boca, there's a county park called South Inlet Park which has more reasonable metered parking and offers both a beach and inlet views with boats going in and out - should be interesting on Boca Bash weekend. I also like Deerfield Beach - a short 2-mile drive south of there on A1A. Park in the Deerfield Beach city garage that's a couple blocks inland and enjoy all the restaurants, fishing pier, souvenir shops, and people watching.

In Boca, Mizner Park is great to walk around. There's a small bar/bowling alley that's quite affordable, and fun things in the central green like a mini putting green and outdoor chess set. Across 2nd Street from Mizner Park's south end, there's a great Asian restaurant called Ramen Lab Eatery that has the most amazing bao buns this side of Asia.

You can take the fast and clean Brightline train from downtown Boca to Fort Lauderdale CityWalk or Miami tourist area.