7:30am-4:30pm is what is currently listed on
DCL for Aruba.
Motion sickness - I can't really comment...no issues in our family.
I've got emails in to several companies and have heard back from several...15%-20% discount taken off the rental price, which really is not all that high to me (compared to paying for a family of 4 on a DCL tour).
This is some info I have found out so far....
The island is only something like 26 miles long if that. Unfortunately there is no one main road which makes a loop around the island. Beaches for swimming and snorkleling are all along the west coast of the island as well as the main road.
Beaches along the eastern coast are wild, rough and DANGEROUS to swimmers!
For a one day visitor, although it involves partial back tracking (sorry there is no way of getting past the Natural Bridge to Arikok National Park, UNLESS you are on a horse...) the spots you would want to visit include: (starting just north of the Palm Beach high rise hotel area-
California sand dunes
California Lighthouse
Alto Vista Chapel
Natural Bridge
On the way back (you will be back tracking toward the high rise hotel area) visit
Arashi Beach and Malmok.
Continue south through the high rise area to Eagle Beach. Then through downtown Oranjestad. Then onto the eastern coastline
Spanish Lagoon
Rodgers Beach
Baby Beach
Grapefields Bay
Boca Grande
Boca Prins
Fontein
Dos Playa
these last few of which are all located within Arikok National Park as well as the White Sand dunes
For the adventurous, the Natural Pool is worth a visit. HOWEVER it is a very long, very rough 4 X 4 ride. I HIGHLY reccommend a horse back riding tour to get there. Either way to get there you will have a sore back end, HOWEVER you won't have the worry of losing a transmission and THEN having to pay for it! Doesn't really matter what kind of insurance you have, the rental operators do not take kindly to those who they feel are "abusing" their vehicles.
Going to try and check out the web for info on the individual sites and we can see what the DIS'ers all want to visit.