They might seem similar on the surface, but with San Diego Bay being natural and Mission Bay being man-made, you’ll find different types of activities you can do at these spots.

Sunset of the Coronado Bridge Over San Diego Bay
Things to Do at San Diego Bay
Looking at the layout, San Diego Bay is much larger than Mission Bay with greater accessibility from the Pacific Ocean for large ships. This makes it the perfect spot for boat tours and cruises, with tons of traffic at the cruise port.
Some of my top-recommended activities on the bay are whale watching cruises and the San Diego Harbor Tour, which is one of my favorite ways to watch the sunset in town.
You’ll also find lots of large sailboats here, plus some speed boat tours. If you’re visiting with the family, hit the beach and boardwalk, which has shops and games.
But I will say for activities like kayaking or stand up paddle boarding (SUP), this may not be the best choice as there are large ships and areas you would need to avoid.

Kids Sailing in Sail Bay
Mission Bay Activities
Mission Bay’s entrance is narrower and the bridge isn’t tall enough for many boats, so large cruise ships can’t access it. However, don’t let this trouble you - it makes up for it by having more recreation options overall. I’d consider Mission Bay to be a water sport lover’s paradise!
Smaller boats can navigate the bay just fine, so there’s lots of sailing. You’ll also find water skiing and fishing, plus calm waters for swimming near the beach. And in my opinion, Mission Bay is an incredible choice for stand-up paddle boarding and kayaking!
There are lots of parks and other open areas along Mission Bay as well, which are ideal for a romantic picnic or a bayside barbecue with the family.
There’s a boardwalk here as well in Mission Beach, but there are fewer shops and it’s mainly used as a running and biking spot with some great views.
The neighborhood is synonymous with outdoor recreation, and it’s a big part of its history. In fact, it was actually the birthplace of the triathlon, with the Mission Bay triathlon predating the first Iron Man event by about four years - and it’s still held annually!

Fly Boarding in Mission Bay
Our Preferred Spot: Mission Bay
You just can’t beat Mission Bay when it comes to recreation and leisure, though San Diego Bay isn’t too far behind.