Which plan has worked for you, and has it been accurate?
I optimize 3-4 times to get a look at the times and then I start moving things around and never hit optimize again! Only evaluate.
Both. It just depends which you want. If you want to keep your order, then evaluate. If you want TPs order which may include crisscrossing the park, then optimise. Either way you can set your walking pace, and minimise waiting, or walking, or balance the 2.