My mother and I leave on Wednesday for the Yacht Club (yippee), we will have her manual wheelchair and are renting a scooter from Walker. I'm an experienced pusher and am not afraid of distance on flater surfaces but I'm unsure of the hilliness of the terrain in each park..which conveyance should we use in which parks? (I ask because she doesn't find the ECV as comfortable as her chair and I'm looking for give her a break from it if possible).