Mile Square Park to the Queen Mary Round Trip:
I've done this ride a bunch of times it's always fun. Mostly bike trails and beach trails with limited street riding.
Roughly 60 miles round trip. It takes about 6 hours with a lunch stop in the restaurant village adjacent to the Queen Mary. There are many different foods available to buy plus some snack venders if that's is more your flavor.
Photo ops galore and some very cool land marks line the route. Usually leave the park around 10-ish to get to the QM around lunch time. The ride back usually is mostly tail wind with the sun at our backs.
A nice day out and change of pace from the usual river trail rides.
Depending on if I have company, I sometimes pack a picnic lunch instead of the restaurant scene. There is a light house in Long Beach that has a small park around it. Perfect for a nice lunch and rest stop before the ride home.