Not sure what time you get into BZE, but maybe consider doing the cave tubing after you arrive (or early the next day) and spend the first night on the mainland (not in Belize City). Much easier and cheaper than going back and forth from Ambergris to the mainland. Plus, if you're taking a puddle jumper to San Pedro, you can fly out of the muni airport for a fair bit less than BZE.
We've always done not-so-secret beach (takes a while, about 4 Belikins) if we're staying on the reef side due to the massive sargassum problem that only seems to get worse every year. Total tourist trap compared to 10 years ago, but no sargassum on that side. Blue Bayou is ok but Sunset Palace would be my recommendation, especially if the sea lice are out in force as there is a lot more seating out of the water + more chill. There are also some solid flats just to the south that you can fish for bones.
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