From the Luna Park Pool to the turnstiles at HS is 3/4 of a mile and takes about 15-18 minutes at a leisurely pace. If you're not in a hurry, I would take the boat. After getting on at the Boardwalk, you will stop at BC/YC and then at the Swan/Dolphin before continuiing on to HS. Those stops take longer than you would expect. Although the boat ride is lovely, it just takes longer than walking.