There is only one executive suite per floor. The last two digits of these rooms number are 10. Be careful, the Grand Hyatt has oversized rooms, which they call junior suites. The last two digits of these rooms are 17. All suites are harbor view.
The Grand Hyatt will not upgrade you to a suite on the Regency Club Floor unless you have already booked a harbor view regency club room and are then using 6K points or a suite upgrade certificate
To experience the best this property has to offer the Grand Club access is a must. The executive suites are very nice. Make sure and check about Club access when staying in a suite. I always stay in 2810 and have club access, but I am diamond and a very frequent guess of the Grand Hyatt.
Order of importance
1) Grand Club Access
2) Harbor view room
3) Executive Suite
Enjoy