ABSOLUTELY love this and 100% do this. My DS lives for Disney. He is disabled and I might outlive him. I often think what will I do but I have come to conclusion that while the first time might be hard and a few tears I think I will feel very close to him there, doing what we used to do together.
After MIL died an extended group of us went on a cruise. She loved to cruise!!! At check in we found a penny face side up so we knew she was with us. My SIL brought MIL clutch purse and brought to dinner each night. We were 7 and they had us at round table for 8. First night they tried to remove the extra chair and we said "no it's for our MIL" and SIL would put her purse at that seat.
Maybe just do things he would love like Tony's or I love idea of gifting somethings to others and see their joy! One night at Tony's a neighboring table (big family, perhaps international) paid for my son and I's meal. It was such a shock and wonderful surprise!!! I have no idea why, we had no conversation other than me saying thank you. But I suppose it meant something to him.
This part is not meant to offend anyone but ........... celebrate his life, not his death. Celebrate his birthday and do not let his death date consume you. Go to places he loved, do things he enjoyed ..... no need to stay focused on where or how he died. When I see roadside memorials I feel so sad for those people who are consumed by a death location. If he loved Disney World - go and celebrate him where you all enjoyed life together.