Hi Natmaz. With the exception of Wharariki Beach, there are plenty of accommodation options in all those areas. It really depends on how long you plan to be in the area, what time of year, and what you are interested in doing there.
Golden Bay is one of those places which is a holiday destination as much for Kiwis as for overseas folk. So it can be particularly busy at certain times of the year. If visiting in peak season (Dec/Jan), it is wise to book ahead. A few campgrounds are on a ballot system.
The local communities are quite passionate and vocal about the issue of Freedom camping. So it is important that you plan on staying in designated camping areas (of which there are plenty). It has been a hotly debated issue over the past couple of years. There have been a few incidents of people taking matters into their own hands with dubious consequences.
Kaiteriteri is probably the best place to explore Abel Tasman NP from. Particularly if you are planning water activities. Pohara Beach has a great camping ground which is very central and well catered for. Very popular with families. Numerous options available all around Golden Bay and Motueka/Kaiteriteri.
Hi Natmaz. Looks good to me.
There is a lot more to do and see in Golden Bay than one day will allow. But that's not a problem. Plenty of good material online about what there is to see so plan ahead as to what you want to see. Lots of free walks and attractions around Golden Bay.
Kaiteriteri is the base for most of the water based ventures into Abel Tasman NP so you'll be able to have a fun time exploring the park. There is a nice beach at K. and a short bush walk over to Little Kaiteriteri (next bay over)
Only question is whether you stay at Pohara or Kaiterteri first. If I remember correctly, you will be coming over from Punakaiki.
Be aware that you don't need to go into Nelson to get to Motueka. About 70kms past Murchinson, you turn left at Kohatu Junction. Passing through Tapawera, you travel down the very pleasant Motueka Valley Highway. You come out behind the airfield in Motueka. (Which has heaps of aero activities available from paragliding, sky diving, pilot your own acrobatic aircraft etc.)
Punakaiki to Kaiterteri is a reasonable trip. There are lots of things to see along the way so that will add onto your times. The trip over Takaka Hill (Marble Mountain) to Golden Bay is quite a challenge for newcomers and not recommended to do it if you are tired. So work out your traveling times. Probably best to stay at K. first then GB next.
Given that you have a full day getting to K., you will be doing your water ventures the following day. So may be worth considering two nights at K., traveling to GB early next day. Overnight at GB then next day to Nelson.
GB to Nelson is around three hours drive with the new Ruby Bay bypass. Looks shorter on the map but Takaka Hill is 30/40 km/per hour speed for most people. You may also be competing with slow milk tankers and logging trucks.
Depending where you are going next, you can explore around Nelson without needing to overnight there. If you are heading towards Kaikoura, you can overnight somewhere around Rai Valley (a couple of legal freedom camping spots near Rai Valley township) or Pelorus Bridge. (DOC campground).
Then you will have time to check out a few sights/vineyards around Havelock/Blenheim on your way to Kaikoura the next day.
(P.S. Re walking in Abel Tasman. The water taxis or explorer boats at kaiteriteri can drop you off at one bay in the park, you walk the track for a few hours, and then they pick you up at another bay for the boat ride home.)