Long flat bike paths for adapted hand cycle?

Hello! I recently got an attachment for my wheelchair that turns it into a battery assisted hand cycle. I have taken it down the strand and around mission bay, also do Lake Murray regularly. Are there other long, flatish (it can handle some hills but nothing crazy) bike baths or trails that this would be good for? It handles compacted dirt pretty well, and I can go around 30 miles with the battery. I don’t mind driving places if they are worth it! Thanks!