Must see/do/eat in San Juan?

I just booked a trip for 5 days from April 16-20 and I'm very excited! I'm staying at a hotel in Condado Beach in San Juan. While I'd love to explore the beauty of the whole island (like Vieques for the bioluminescent bay, I'll have to save it for my next trip), I don't want to travel too far since I'll be solo, and I don't want to get a rental car. I'd be willing to take an Uber for an hour or less for a day trip from San Juan, but I'd prefer to mostly stay in the San Juan area.

What are the absolutely can't miss places to visit? Where's the best food (besides seafood bc I'm allergic)?