sorry to hear that the caves are now closed due to folks ruining them.
paul had been a few times and enjoyed expedition.
i on the otherhand would never consider going in and or near the caves.
i am always the 1st to point folks to certain things/expeditions/adventures that i would never consider doing myself (caves, helicopter tour, parasailing, atv tours)
i am wimpish.
and....back to the question
sometimes doing the activities on the weekend is a good choice is because a lot of folks are either leaving aruba or arriving on aruba.
agree with the baby beach (stay away on the weekend) advice.
also too some of the restaurants are closed on sundays or mondays so make certain that you have your restaurant schedule handy.
light house always has folks, the most crowded time is sunset.
kukukunku tour do NOT do it the night before you go home. aka hangover
jolly pirates is good anytime
leave plenty of time for R & R on the beach and happy hours.
andrea