If you have the energy on your first day, you might want to go over to Jambo. You can use the pool there. If you want to eat but you don't want to go to a table service restaurant, your options are better at Jambo. The Mara is a quick service restaurant by the Jambo pool. The gift shop at Jambo has a bigger selection of food than the gift shop at Kidani. Also, the Mara has grab and go food items.
As mentioned above, there is a van which goes between the two resorts. Or you could walk. Also, check on the bus service - I believe all theme park buses stop at Kidani, then Jambo, then the theme park. The Disney Springs bus stops at Jambo, then Kidani, then Disney Springs. So you can take one of the buses and get off at the next stop -- but ask before getting on the bus!
I believe you can use night vision goggles to look at the animals at either resort, if you still have energy after it gets dark.