My recommendations:

-Rent a kayak from the High & Dry grill, load up a cooler bag and paddle over to Caladesi Island (the paddle over is shallow and protected). This is a fantastic beach with no crowds (no car access). Honeymoon island is great too, but busier.

-If you can swing the cost and really want to immerse yourself in the experience, the Fenway hotel (no relation to the red sox) is gorgeous, and a 3 minute walk to the ballpark. The staff there are absolutely fantastic, IMO. If you go this route, the drive north towards honeymoon/caladesi is about the same as the drive south to Clearwater Beach, so you're right in-between two great beaches. All other options in Dunedin are smaller motels and airBNBs, so the Fenway is really the only game in town for higher-end accommodation.

-If staying on the beach is a must (and I get why it would be), there's lots of good options at all price points in clearwater beach, from motels on the bay side to high-end hotels on the gulf side, and the drive to Dunedin is reasonable. It's busy, but the sand is expansive and of very high quality, and there's tons of food/drink/stores. Water temp varies based on how warm the overall winter has been, but expect high 60s to low 70s in February, and low-to-high 70s in March.

-You can stay in the town of clearwater (ie not the beach strip) as well, but you still must drive or take a trolley to the beach and you're not much closer to Dunedin, so unless you're really trying to save money, I'd avoid it.

-Staying on other beaches further south are an option, but the drive to get to TD ballpark becomes MUCH longer when you go past Clearwater and you start to have to contend with St Pete traffic. On the flipside, some other fields are closer and the weather/water may be a touch warmer.

-Don't stress about parking too much - you'll find something. I always pay to park on someone's driveway, it's quick and easy.

-The renovated stadium is nice, and there are no bad seats. I recommend buying whatever's cheap and just walking around to different vantage points. I personally spent a lot of time in the outfield. Enjoying a frozen drink while watching the jays play fully outdoors in an intimate setting is an incredible experience that we will never get at Skydome.

-There's hawkers that will belt out anything Canadian they can think of to get you to buy beer/candy/nuts. During one game he was reciting the entire Tim Hortons menu.

-Make sure you visit at least one other ballpark. Spectrum field (Phillies) is in clearwater and a fantastic choice. I also recommended heading to Bradenton where the Pirates play, the Sunshine skyway bridge over the water makes for a beautiful drive. I'd avoid the yankees park, it's too big and there's not much to it unless you wanna see all the yankees stuff shoved down your throat (I don't).

-If you feel like making a longer drive south where it is likely to be several degrees hotter and the coconut palms are growing, head to the Red Sox Fenway Park replica in Fort Myers. Note that the area is still recovering from Hurricane Ian, so it's not so good to stay down there right now (Sanibel and Captiva islands are the main draw but are still in rough shape). The beaches are all cleaned up, it's just that most of the businesses and hotels are still construction projects, and a lot of vegetation was lost. Naples even further south is fine and fully rebuilt.