If you end up staying at CBR it’s super easy to take a break from EP. The SL will get you back super fast. But if you want to hang out in the BW/BC area hmmm….i love the boardwalk but it’s hot mid day. You could do a snazzy lunch at the Cake Bake Shop if the price isn’t too much for you to swallow. Rent a surrey bike maybe? There’s a great green space there but again, hot.
I might spend some time at riviera. Primo Piatto has great QS. You could grab food and let the kids play bocce ball and life sized chess. CBR also has a playground!
Oh and to speak to the BC solarium it’s a lovely, quiet spot. Good for napping and tablet time w/ headphones for sure. But the kids might get bored as there isn’t much else to do in there.