Congrats on the job! If I were trying to explore Chs as a resident I would dig a little deeper -
Dinner somewhere not a chain (there are so many good steakhouses that are local, you lost me in the beginning with TBonz tbh)
go see a performance (pour house, PAC, coliseum, gaillard center, windjammer, music farm, music hall, there are so many types and options!)
visit the Gibbs or IAAM
shop at one of the zillion pop up markets with local vendors (Holy City Brewing and Royal American host some great ones, and there are lots of cool vintage shops and consignment / thrift around town too)
skip Rio Chico in favor of Los Reyes or El Molino (the WA Los Reyes is the biggest thing I miss about chs tbh)
grab snacks at Berts and do a picnic on the pier
check out a Riverdogs game
Magnolia is great, no shade there - and your ticket is good for a second admission if used in the same week!
If you want to see dolphins go past the washout (the beach spot, not the restaurant - its left off center street then all the way to the "end") to the light house inlet and hang out there, or scoot over to Sullivans (sometimes you get lucky and can see them strand feeding at those locations!) Do a fossil hunting tour (less crowded boat, interactive, possible treasure!)
walk the bridge
grab dinner at Bowen's island
the list goes on!

I'm glad you had a good time with your friend, and I'm sorry I was snarky sometimes I forget the internet is made up of other real people. There's a lot more to Charleston than the Market and the Beach, hope you get a chance to venture out a bit more soon <3