Charley Young and Kam 1 are good walking beaches, for a swimming beach head for Kam 111, you will usually have good parking.
Also get a snorkel guide at any Maui Dive shop. I do not get my gear there, just the maps. I get my gear from Maui Dreams dive shop, its a local place and very friendly.
http://www.mauidreamsdiveco.com/dive/index.php
For Turtles try Wailea beach, usually good parking if you get there early.
Most of the best snorkeling will happen before 12noon due to the trade winds.
Save time for an evening booze cruise from Lahaina but forget the dinner cruise.
Ahihi Bay is always (90%) good for snorkeling.
Maui Vista is a nice Condo We have used them in the past they have a great central location.
BTW Charles Lindbergh is buried about 8 mi past Hana., Lt turn just past mi marker #41. PalaPala Ho'omau Church yard. As I recall it's really a Lt off the road and a Lt. again to the Church, It's been 2 years since we visited the Church yard. It's a very tiny Church.
If you plan to snorkel and want to take pictures then stop at wal-mart to pickup a waterproof camera, get the snapsight camera with the flash, price $14.95 last check. The flash will make all the difference, the focus distance for the best picture with this camera is about 5-6ft. The camera is re-loadable and good to 100ft. so I would feel safe to about 60ft.
For land photography head upcountry in the early AM. You will have your choice of sunup at Haleakala and cruising around on your way back. You can get some great pictures of the sunrise line as it crosses the island.
If you have not been to Maui in 33years you will be shocked and maybe disappointed but there are still many places to get away from it all.