Any recommendations? I will be going in April.

If you like snorkeling, you have to take an excursion to Klein Bonaire, a quick sail from the main town. Amazing coral with lots of turtles. Incredible water clarity. We went with Woodwind charters but there are several good outfits.

I can give you some advice according to food
I personally like to eat a lot. Therefore, I visited a very large number of restaurants there. Of course, there is great restaurant of fast food King Kong Burger (in case you prefer burgers ). However, if you want to enjoy their cuisine, you can visit the following restaurants: Blue Garden Brazilian Grill & Pizza Gourmet; Mezze; Eddy's Bar & Restaurant; Kite City and Joe's Restaurant

Thanks! Anything you would recommend as activities?

Snorkelling, scuba diving, renting a car and driving around the island, visiting Donkey Sanctuary, Washington Slagbaai National Park (we saw a wild boar, a 4x4 would have been better for the park), Salt pans and slave huts.