Do you have an option of storing luggage? Plan to stay here and do road to Hana, with a night in Hana back the next day so about 24hrs. I have read reviews on car theft on the road to Hana which would make for a terrible trip in all our luggage was stolen the first day.
Sad to say, many lots for trails and attractions are littered with broken window glass...don't leave valuables visible in the car, put them in the trunk if you must take them...as for the hotel, Maui Seaside was very secure, and I'm sure the front desk would happily help you however they can.
Get an answer from Maui Seaside Hotel staff and past guests.