Do not put paper napkins UNDER the scones/ cakes etc... they just get soggy and unuseable AND half the cake stick to it!!
YY to this! Why do cafes do it? It makes no sense.
A menu outside, that you can read without having to lean over people sitting at any outside tables.
Menu font size, typeface and colour chosen for readability rather than fashion (not extra-fine light grey that looks elegant but can only be read by people with 20:20 vision under a 200W bulb).
If you have vegetarian, vegan, GF, nut-free options, label them clearly (and accurately!) on the menu so people don't have to ask. If you do this by adding allergens codes to each dish, remember to include a key. Label all the sections the same way - loads of places do the savoury dishes but don't bother with puddings and drinks.
Try all the dishes you serve. Try sitting on all your chairs for a decent length of time and make sure the table and chair heights work together.
At the top of the home page of your website give your address (with map), opening hours and menu (menu can be a link but no more than 1 click away, and not a PDF). These are the things I care about, not your 'journey' to opening the place.
Check your website works in mobile view, and with a screen reader.