Motorboat / Motor yacht
The best option for speed, luxury and bling is a motorboat or a motor yacht!
This would be the ideal choice for a family or group of friends who don't want to make lengthy open-water crossings but have a boat that can quickly navigate and switch from location to location before dropping the anchor in a quiet bay for a day of swimming and tanning.
If you're working with a tight budget, consider the cost of fuel in mind and the size of your boat / yacht.